The first insular areas that the United States occupied were
Baker Island,
Howland Island, and
Navassa Island (1857). Then
Johnston Atoll and
Jarvis Island (both in 1858) would be claimed. After the
Spanish–American War in 1898, several territories were taken that are still under U.S. sovereignty (
Puerto Rico and
Guam, both in 1898).
Palmyra Atoll was annexed along with the
Republic of Hawaii (formerly a
Kingdom) that same year.
American Samoa was reclaimed the following year (1899). In 1917, at the height of
World War I, Denmark sold the
Danish Virgin Islands to the United States. The U.S. Navy annexed Kingman Reef in 1922.
Spain had sold the
Northern Mariana Islands to Germany in 1899. The islands passed to Japan, which in turn lost them to the United States in 1945 after the end of World War II. The
Marshall Islands became self-governing in 1979 and fully independent along with the
Federated States of Micronesia in 1986.
Palau achieved independence in 1994. The three countries maintain sovereignty with free association status with the United States, which provides them with defense assistance and economic resources.
Timeline ;August 28, 1867 :Captain
William Reynolds of the
USS Lackawanna formally took possession of the
Midway Atoll for the United States. ;August 13, 1898 :
United States Navy under Admiral
George Dewey,
United States Army's
Eighth Army Corps under Major General
Wesley Merritt, and Lieutenant General
Arthur MacArthur Jr. captured the city of
Manila from Spain after Governor-General of the Philippines
Fermin Jáudenes surrendered the city, which then remained Spanish-occupied even after the declaration of Philippine Independence from Spain and the establishment of the
First Philippine Republic on June 12, 1898. ;February 4, 1899 :
Philippine–American War began between the First Philippine Republic and the newly arrived
US Military Government. ;April 11, 1899 :The
Treaty of Paris of 1898 came into effect, transferring
Guam, the
Philippines, and Puerto Rico from Spain to the United States, all three becoming
unorganized, unincorporated territories. Puerto Rico's official name was changed to
Porto Rico, a phonetic reinterpretation of the Spanish name for the territory. ;April 12, 1900 :The
Foraker Act becomes effective, making Puerto Rico an unincorporated and organized territory of the United States. ;June 7, 1900 :The United States took control of the portion of the
Samoan Islands given to it by the
Treaty of Berlin of 1899, creating the
unorganized, unincorporated territory of
American Samoa. ;April 1, 1901 :General
Emilio Aguinaldo,
President of the First Philippine Republic and Filipino leader in the
Philippine–American War, surrendered to the United States, allowing the U.S. to form a civilian government for the Philippines. ;August 29, 1916 :The Philippine Autonomy Act or
Jones Law was signed, promising the
Philippines independence. ;March 2, 1917 :
Jones–Shafroth Act reorganized Puerto Rico. This act conferred
United States citizenship on all citizens of Puerto Rico. ;March 31, 1917 :The United States purchased the
Danish West Indies and renamed it as
U.S. Virgin Islands under the terms of a treaty with
Denmark. ;May 17, 1932 :The name of Porto Rico was changed to Puerto Rico. ;March 24, 1934 :The
Tydings–McDuffie Act was signed allowing the creation of the
Commonwealth of the Philippines. ;November 15, 1935 :The Commonwealth of the Philippines officially inaugurated
Manuel L. Quezon as the President of the Philippine Commonwealth, held at the steps of the
Old Legislative Building. The event was attended by 300,000 Filipinos. ;December 8, 1941 : Commonwealth of the Philippines was
invaded and occupied by Japan during
World War II, initiating "the most destructive event ever to take place on U.S. soil". Over 1,100,000
Filipino American civilians died during the war. ;July 25, 1952 :Puerto Rico becomes a
Commonwealth of the United States with the ratification of its constitution. ;January 9, 1978 :The
Northern Mariana Islands Commonwealth Constitution, which had been ratified by voters on March 6, 1977, goes into effect. ;October 21, 1986 :The
Marshall Islands attained independence from the
Trust Territory of the Pacific Islands, though the trusteeship granted by the
United Nations technically did not end until December 22, 1990. The Marshall Islands remained in
free association with the United States. ;November 3, 1986 :The
Federated States of Micronesia attained independence from the Trust Territory of the Pacific Islands, and remained in free association with the United States. ;December 22, 1990 :The
United Nations terminated the Trust Territory of the Pacific Islands for all but the Palau district. ;May 25, 1994 :The United Nations terminated the Trust Territory of the Pacific Islands for the Palau district, ending the territory and making Palau independent, as it was not a territory of the United States. ;October 1, 1994 :Palau attained independence, but it remained in free association with the United States. ;December 11, 2012 :The
Legislative Assembly of Puerto Rico enacted a
concurrent resolution to request the
president and the
Congress of the United States to respond diligently and effectively, and to act on the demand of the people of Puerto Rico, as freely and democratically expressed in the
plebiscite held on November 6, 2012, to end, once and for all, its current form of territorial status and to begin the process to admit Puerto Rico to the union as a state. ;December 22, 2022 : The U.S. House of Representatives voted in favor of the
Puerto Rico Status Act. The act sought to resolve Puerto Rico's status and its relationship to the United States through a binding plebiscite to be held in November 2023; however, the Senate never acted on the bill. ==Citizenship==