| Summary: | The revolution of 5 October 1910, brought a political change in the form of a republican parliamentary regime, which required another kind of party system. Out of the fragmentation of the historical Portuguese Republican Party, in 1911-1912 there emerged a new structure of parties and political groups. During the First World War, the party system evolved in a relatively normal manner, but after 1919 it changed completely, with a series of dissidences, splits, and mergers. Throughout the First Portuguese Republic, the Portuguese Republican Party (the Democratic Party), which was reformed in 1911-1912, asserted its political leadership, with the great exception of the period of the republican presidential regime of Sidónio Pais.
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