After the republican uprising of 5 October 1910 that overthrew King
Manuel II, a republican constitution was approved in 1911, inaugurating a
parliamentary regime with little power in the hands of the president and a bicameral system. The republic caused important fractures in Portuguese society, especially between the monarchical rural population, the unions and the Catholic Church. Even the
Republican Party was divided. The most conservative sector separated to form the
Evolutionist Party and the
Republican Union Party. Despite those secessions, the
Portuguese Republican Party (commonly known as
Democratic Party after this split, unlike the previous
Portuguese Republican Party to the
proclamation of the Republic), led by
Afonso Costa remained the main political force of the Republic. The opposition forces began to use violence as a method to get closer to power, as there was no truly democratic political and parliamentary tradition, while almost all political factions were fighting for radical transformations that would end the immobility that had characterized the
House of Braganza. The
Democratic Party (officially
Portuguese Republican Party) saw in the beginning of the
First World War a unique opportunity to achieve its objectives: an end to the threat of an invasion by Spain and foreign occupation of the colonies, and within the internal level, creating a national consensus around the regime and even around the party. These domestic objectives were not achieved, since
participation in the conflict decreed in 1917 was not subject to national consensus and it was not possible to mobilize the population, even more so there was hostility towards entering the war when Portugal had to send a contingent of almost 12,000 soldiers to France and colonial troops from Germany invaded the Portuguese colony of
Mozambique. What happened was the opposite: Portugal's financial difficulties prevented it from forming an adequate contingent for the war, and the armed forces were not prepared for a fight on a European scale, which is why internal criticism of Portugal's entry into the war caused ideological differences to widen. The lack of consensus on Portugal's participation in the war made possible the emergence of two dictatorships, led by
Pimenta de Castro (January – May 1915) and
Sidónio Pais (1917–1918), called the
President-King.
Sidonism, also called
Dezembrismo, contained certain elements of modernization, but said regime preached some of the political solutions that would be used by the dictatorships
totalitarians and
fascists of the 1920s and 1930s. Sidónio Pais tried to rescue traditional values, especially the
Pátria and tried to govern in a charismatic way. Attempts were made to abolish traditional parties and alter the existing model of national representation in parliament (which was said to exacerbate divisions within the Homeland), through the creation of a
corporatist senate and a single party, the
National Republican Party, as well as the attribution of functions to its leader. The state carried out an economic policy
interventionist persecuting unions and labor movements. Sidónio Pais also attempted to restore public order, turning the republic into a more acceptable model for the monarchists and Catholics who still remained a political force. The power vacuum created after the assassination of Sidónio Pais on 14 December 1918 led the country into a brief civil war. In northern Portugal the restoration of the monarchy was proclaimed on 9 January 1919 and four days later a monarchical insurrection took place in
Lisbon. A republican coalition, led by
José Relvas coordinated the repression of the uprisings using military personnel loyal to the regime and armed civilians. After a series of confrontations with the monarchists, they were definitively defeated in
Porto on 13 February 1919. This military victory allowed the
Portuguese Republican Party return to government and emerge triumphant in the elections that took place during that year, winning them by an absolute majority. == Search for stability ==