Early history During its early history, the province was inhabited by various ethnolinguistic groups, including the
Ilocanos,
Pangasinenses, and Cordillerans (
Igorots), who actively engaged in
trading and
bartering while practicing
animistic and
polytheistic indigenous religions and traditions. These settlements were primarily inhabited by the
Samtoy (Ilocanos). Historian
William Henry Scott documented that Balaoan was historically referred to as being
"rich in gold" due to its proximity to the gold mines in the
Cordillera region. This route facilitated the transport of gold from the
Ibaloi villages of
Acupan and
Balatok in the southern areas of present-day
Benguet to the trading centers of Aringay, with further distribution to the port settlement of Agoo.
Spanish Colonial Era 16th Century A year after
Miguel Lopez de Legazpi made
Manila the capital of the Philippines on 24 June 1571, the Spaniards launched expeditions to
Northern Luzon "
to pacify the people in it". , who led the colonization of the
Ilocos Region In June 1572, Spanish explorers led by conquistador
Juan de Salcedo, the grandson of Miguel López de Legazpi, launched an expedition northward and founded several Spanish settlements, including those in the
Ilocos region and the city of
Vigan. Although some initially resisted, those who complied were allowed to remain. This encounter earned Agoo the title
"El Puerto de Japón" (Japanese Port) from Miguel de Loarca in 1582, as it had long served as a hub for trade among Japanese and Chinese merchants and local natives. in the Philippines, circa 1590s|leftSalcedo continued his expedition northward and arrived at what is now
San Fernando.
17th century By the 17th century, the Spanish had established settlements, or
pueblos, organized into sitios and rancherias, in Igorot land in La Union. These were governed by a
gobernadorcillo,
alcalde-mayor and
cabeza de barangay, with many of these settlements established by
Augustinian friars during the 16th century's expansion phase. Society during this period was divided into two classes: the babaknang and the cailianes. The
baknang or
babaknang means
"the rich" and
agtuturay or
agturay refers to
"the powers-that be" or
"the authorities." Propertied, landed, and educated, they formed the local elite class or were the
principalia or
insulares who spoke
Castilian, On the other hand, the unlearned
cailianes had less or no property that spoke
Iloco,
Pangasinan,
Kankanai and
Ibaloi. Iloco served as the province's
lingua franca. The Spaniards' search for gold (oro) in
Igorot territories fueled their expeditions. Religious orders were also motivated by opportunities for missionary work. By 1620, however, the gold trade had begun to decline in the province including the Aringay-Balatok-Tonglo, Bauang and Bangar gold trails.
Captain Garcia de Aldana led expeditions into areas like
Aringay,
Bauang, and
San Juan, while
Sargento Mayor y Capitan Alonso Martin Quirante centralized the industry in 1624, deploying a force of 1,748 troops, including
Spaniards, Chinese, Japanese,
Mexicans, and 500 Ilocanos. Many converted to Christianity to avoid persecution, while others fled to the Cordilleras. In 1661,
Andrés Malong of Pangasinan, who declared himself king, led a rebellion against Spanish colonial rule in an attempt to liberate several areas in the northern pueblos of Pangasinan and the
Ilocos provinces.
18th century In the early 1700s, Spanish missions in
Agoo,
Bauang, and
Bacnotan aimed to convert resettled Igorots through the Spanish
reducción policy, which subjected natives to harsh treatment. This led to the
baptism of Igorot chieftain in
Tondo under
Governor-General Pedro Manuel de Arandía Santisteban This agreement, facilitated by the
Capitanes Pasados, reinstated highland-lowland trade, which had been disrupted three years earlier due to the killing of an Igorot and the subsequent retaliatory killing of an Ilocano from Bangar. Lieutenant Colonel Guillermo Galvey led campaigns into the Cordilleras, using towns like Agoo, Bauang, Bacnotan, and San Juan as military bases. These structures, ranging from 6 to 7 meters in height, were constructed along the coastline in towns such as
Namacpacan (Luna),
Balaoan,
San Fernando, and
Bauang. These baluartes played a crucial role in protecting coastal settlements and securing trade routes throughout the 19th century.
Formation of La Union La Union was officially established on 2 March 1850, through the unification of territories from the provinces of
Ilocos Sur,
Pangasinan, and the
Cordillera, making it the 34th province of the Philippines.Thus on 29 October 1849, Governor General Claveria signed the
promovido (proposal) to unite the
Pangasinan-Ilocos-Cordillera areas into a new province called La Union (the official name designated by Claveria himself) as San Fernando as
cabecera (capital) and
Amburayan River in the north and Rabon River in the south as provincial boundaries. For 124 days, high and important Spanish colonial officers studied and deliberated on the proposition to create La Union or not. On 2 March 1850, Governor General Antonio María Blanco signed the s
uperior decreto that founded La Union – the 34th province since the founding of Cebu in 1565. It was classified as a
Gobierno Politico-Militar (Political-Military Government). Blanco appointed, on 4 March 1850,
Captain Toribio Ruiz de la Escalera (Claveria's former trusted aide de camp) as the first Gobernador Military y Politico. La Union is the union of lands, people, cultures and resources. On 18 April 1854,
Queen Isabella II of Spain issued the
real orden (royal decree) from
Madrid confirming Blanco's s
uperior decreto. By 1860, there was significant progress in commerce and agriculture in the province. La Union became an exporter and export hub of
tobacco,
rice, and
sibucao from the 1860s to the 1880s.
Uprising of 1898 The revolution in La Union began on 22 May 1898, with a small uprising in
Santo Tomas. A shot from a small
revolver (
“una revolver pequeña”) was heard, igniting the
“seditious movement of Union.” By April 1899, Filipino guerrillas, under the command of
General Manuel Tinio, had prepared for combat, constructing
trenches throughout the province. Tinio's forces numbered 1,904, including 68 officers, 200
bolo men "hermano", 284
auxiliaries such as armorers,
telegraphers, medical corpsmen,
cavalry,
artillerymen, and two Spanish engineers stationed in Northern Luzon. On 16 November 1899,
President Emilio Aguinaldo arrived in La Union via the
Tubao trail, making his way to
Aringay, where he was welcomed by the townspeople (
cailianes) and elites (
babaknang). From Aringay, Aguinaldo continued his journey through
Cava,
Bauang, and
Naguilian where they spent the night in
convent. • Guerrilla Unit 1: Operated in
Bangar,
Namacpacan (Luna), and
Sudipen under
Captain Anacleto Mendoza. • Guerrilla Unit 2: Operated in
Balaoan,
Bacnotan, and
Santol (rancheria of Balaoan) under
Captain Aniceto Angeles. • Guerrilla Unit 3: Operated in
San Juan,
San Fernando,
San Gabriel, and
Bagulin under
Captain Furtunato Gaerlan. • Guerrilla Unit 4: Operated in
Bauang,
Caba,
Naguilian, and Galiano (now
Burgos) under
Captain Rivera. • Guerrilla Unit 5: Operated in
Aringay,
Tubao,
Agoo, and
Santo Tomas under
Captain Santiago Fontanilla. Simultaneous battles were fought across various towns, including Santo Tomas, Aringay, Naguilian, Bauang, and San Fernando. By 19 November, the Americans had taken Santo Tomas and Agoo. The integration of non-Christian tribes from the
Cordilleras, referred to as the
“taga-Montañosa,” became another priority. In 1902, Governor Taft proposed incorporating these groups into the municipal code or merging them with
Benguet. By 1905, tensions between Bangar’s lowlanders and mountain communities led to court interventions. In 1906,
Igorot settlements were transferred to sub-provinces of Benguet and
Amburayan under
Lepanto-Bontoc province to resolve jurisdictional and tax-related disputes. By 1911, many non-Christians sought permission to resettle in lowland areas.
Japanese Occupation The
Japanese invasion of La Union during
World War II was a pivotal moment in the province's history, given its strategic importance to both
Allied and Japanese forces. In 8 December 1941, Japan launched an attack on U.S. military installations including the
Camp Wallace and residential areas in the province, following the attack on
Pearl Harbor. By 11 December, the Japanese forces had successfully captured
Vigan and dispatched additional troops to seize
Laoag and its airfield. As American forces retreated,
Lieutenan Gen. Masaharu Homma left a small garrison in Vigan and redirected the main forces to support operations at
Lingayen Gulf. By 20 December, the combined forces of the Col. Kanno and
Gen. Shizuichi Tanaka Detachments advanced south along Route 3. By 21 December 1941, Japanese forces had occupied
Bacnotan following the successful overcoming of Philippine defenses in the area. On 22 December, they advanced to
San Fernando further consolidating their position. Japanese troops also landed in
Agoo and swiftly established control over the town by early 1942. Despite these rapid advances, Filipino and American forces continued to resist the Japanese occupation, contributing to the broader efforts of the Allied campaign in the Philippines.
Battle of Rosario (Invasion of Lingayen Gulf) On 22 December 1941, the Japanese 4th Tank Regiment and the 47th Infantry Regiment under the command of Col. Isamu Yanagi, supported by a massive flotilla of navy ships tried to land in
Agoo to make it one of three major beachheads for the
Japanese Invasion of Lingayen Gulf, although weather dispersed their forces and made them deploy on a wide stretch of beach that ranged from
Poro Point (San Fernando) to as far south as Damortis. These forces later met the commonwealth defence forces—consisting of the
26th Cavalry Regiment (
Philippine Scouts), the Philippine 21st Division, the Philippine 11th Division, and the newly formed Philippine 71st Division—in what would later be called the
Battle of Rosario. During the Japanese occupation in the province, La Union was governed by Gov. Jorge Camacho (1941–1942), Gov. Bonifacio Tadiar (1942–1944), and Gov. Bernardo Gapuz (1945) under the administration of
President José P. Laurel's Japanese-sponsored
"puppet" government. The province endured strict military controls, forced labor, food shortages, and widespread violence including
extrajudicial killings and
sexual violence. Despite these conditions, resistance movements emerged, with many residents engaging in guerrilla warfare against Japanese forces. Guerrilla camps was established all over the province including Camp Spencer in
Darigayos, Luna and Camp 121 and Barrio San Cristobal in
Bangar.
Mangkaeng Massacre In
Naguilian, over 400 refugees from the barrios of Imelda, Natividad, and Ortiz sought refuge in the small, forested sitio of Mangkaeng in barrio Gusing Norte to escape Japanese forces stationed in the town proper as part of
General Tomoyuki Yamashita’s rear guard during his retreat to the
Cordillera mountains. The area served as a strategic route for Japanese soldiers traveling between lowland and Cordillera camps particularly
Baguio. On the early morning of 23 January 1945, Japanese troops launched a sudden and brutal attack on Mangkaeng, aiming to eliminate potential resistance or witnesses. The unarmed villagers were caught off guard as gunfire (
bayonet) erupted, killing men, women, and children. Some families attempted to flee into nearby creeks and the dense forest, hoping for cover, but the soldiers were relentless, pursuing and killing those who tried to escape. Others hid in nearby caves or bushes, clinging to the hope of survival while hearing the cries of those captured. Some survivors managed to reach neighboring villages, where they warned others of the massacre, spreading shock and grief across the province.
Battle of San Fernando Following the Battle of Baroro, Allied forces launched a concerted attack on Japanese strongholds to the south of Baroro. This included operations targeting key enemy positions along Oaig Creek, where it crossed the San Fernando–Camasin Road, as well as strategic locations such as Reservoir Hill, Insurrecto Hill, and the Bacsil–Apaleng Range. These assaults took place during the second week of February 1945 as part of the broader campaign to secure San Fernando and its surrounding areas. By 24 March 1945, after the Battle in Bacsil Ridge Allied forces had successfully secured the entire San Fernando area. This victory enabled the establishment of a critical military base "
Camp Wallce" at Poro Peninsula, which became the headquarters for U.S. Army Base M. The area also served as a vital build-up zone for the projected invasion of Japan, marking a crucial step in the Allied preparations for the final stages of the
Pacific War. The
Battle of Bacsil Ridge ended the month-long battle for control of
San Fernando. The Japanese defenders called the Hayashi Detachment, composed of 3,000 armed troops and 2,000 unarmed support forces, took hold of San Fernando and its surrounding areas which denied entry to the port of the town and a road leading to
Baguio. As part of the San Fernando-Bacsil Operations, the 1st Battalion of 121st Infantry were sent to loosen the enemy positions starting late February with the assistance of the Allied Air Force. The 1st Battalion made a general attack to the ridge on 16 March 1945 and fought the Japanese defenders until the capture of Bacsil on 19 March. On the same day, the 3rd battalion captured the Reservoir Hill.
Liberation of BauangThe Liberation of
Bauang, was part of the San Fernando-Bascil operations aimed to liberate the province of La Union and open one of the roads to
Baguio. As San Fernando was in ruins at the time,
Bacnotan became the provisional seat of the province administration after the war. The La Union National High School was also relocated to Bacnotan as a result of this relocation. When things returned to normal, the provincial government was relocated to San Fernando, followed by the La Union National High School. The North Provincial High School was established after the provincial high school in Bacnotan was transferred (now Bacnotan National High School).
Post-war Era The postwar recovery period marked a return of the
tobacco industry to the Ilocos Region. Ever since the end of the tobacco monopoly, tobacco production had declined in the Ilocos as Filipinos started shifting from locally made cigars to foreign made cigarettes. But after reading a feature article series by
Maximo Soliven which explained why Virginia tobacco would grow well on Ilocos soil, businessman
Harry Stonehill was convinced to invest extensively in rebuilding the industry. He established the Philippine Tobacco Flue-Curing and Redrying Corporation (PTFCRC) in 1951 and recruited farmers throughout Region 1 to produce tobacco. The following year, La Union Congressman Manuel T. Cases filed a bill to "limit the importation of foreign leaf tobacco," which was eventually signed by President
Elpidio Quirino as Republic Act No. 698. This allowed Stonehill's investments to make a handsome profit, While Stonehill was later deported in the 1960s for tax evasion and bribery of government officials in what would later be called the
Stonehill scandal, the tobacco industry continued to grow. political life in La Union was not significantly impacted by
Ferdinand Marcos’
declaration of Martial Law in 1972. The powerful family factions which had dominated La Union politics since before the American colonial era largely remained in place, although the family of Congressman
Jose D. Aspiras became much more prominent after he became Marcos’ Tourism Minister. The main political change was the increased power of regional and provincial offices of national agencies, whose directors were answerable directly to Marcos. The Marcos administration's use of violent methods for stifling dissent thus mostly took place in other, non-Ilocano provinces, such as nearby
Abra,
Kalinga, and
Mountain Province. and his successor
Jose D. Aspiras was also a close associate of Marcos who was made Minister of Tourism after Martial Law was declared. But there were still La Union natives who were willing to object to the authoritarian practices and
abuses of the Marcos administration, despite personal risk. This included San-Fernando-raised student activists Romulo and
Armando Palabay, UP Students and La Union National High School alumni who were imprisoned for their protest activities, tortured at Camp Olivas in Pampanga, and later separately killed before the end of Martial Law. Romulo (age 22) and Armando (age 21) were posthumously honored when their names were etched on the Wall of Remembrance at the Philippines'
Bantayog ng mga Bayani, which honors the heroes and martyrs who fought the authoritarian regime.
Agoo, La Union, native
Antonio L. Mabutas had become Archbishop of Davao by the time of Martial Law, and spoke actively against the human rights abuses of that time, particularly the torture and killings of church workers. The pastoral letter he wrote against Martial law, "Reign of Terror in the Countryside," is notable for having been the first pastoral to be written against Marcos' martial law administration,
Contemporary 1990 Luzon earthquake La Union was severely hit by the
1990 Luzon earthquake. Five municipalities in La Union were affected:
Agoo,
Aringay,
Caba,
Santo Tomas, and
Tubao with a combined population of 132,208. Many buildings, including the Agoo Municipal hall, the
Museo de Iloko, the parish church of Aringay, and the
Basilica Minore of our Lady of Charity, collapsed or were severely damaged. 100,000 families were displaced when two coastal villages sank due to
liquefaction. The province suffered many casualties leaving 32 people dead.
2010s Tourism Boom From the mid-2000s to the early 2010s, an influx of entrepreneurs began putting up establishments such as
boho-chic-style
art hostels and
third-wave coffeeshops in
San Juan and
Agoo. They were initially attracted to the already-established surfing scene of
Barangay Urbiztondo in San Juan, but eventually envisioned business in the province as an alternative to the stresses of city-based employment. This coincided with the phase-by-phase opening of the
Tarlac–Pangasinan–La Union Expressway (TPLEX), which made La Union more accessible to tourists from Metro Manila. Alongside the rising influence of social media outlets
Twitter and
Instagram, these factors led to a drastic tourism boom that made San Juan—previously been seen as just one of the Philippines' many surfing venues—a major backpacker's destination whose attractions centered on surfing and art. Sison-Rosario segment San Juan began to be featured prominently in independent films such as Jay Abello's 2015 film
Flotsam and JP Habac's 2017 film ''I'm Drunk, I Love You'', Among Philippines literary circles, the town of Bauang has also become a pilgrimage site of sorts for celebrating the life of and works of writer and World War II martyr
Manuel Arguilla, with writers visiting the author's hometown to experience the landscapes that inspired him, and which featured prominently in his stories. The most prominent event celebrating Arguilla was the 2017 run of the Taboan Literary Festival, a celebration of Philippine literature which changes venues every year, organized by the
National Commission on Culture and the Arts during every National Arts Month in February. Among the prominent artists who spoke about Arguilla at the festival were writer-academic
Butch Dalisay and
National Artist of the Philippines for literature
Bienvenido Lumbera. ==Geography==