The alliance was formed on 11 February 1926, and consisted of four political groups ranging in various types of republicanism:[1] Although united by their common opposition to the monarchy and dictatorship, the group was a politically varied.
[2] The creation of the Radical Socialist Republican Party encouraged Republican Action to become a political party in the early months of 1930, remaining within the alliance despite its evident political disagreement with the radicals of Lerroux.
On 14 May 1930, the alliance and the radical socialists formed a revolutionary committee, eventually leading to the establishment and consolidation of the Second Spanish Republic.
On 17 August 1930, Azaña and Lerroux, representing the alliance, participated in the assemblage of the Pact of San Sebastián, which would lead to the formation of the Provisional Government of the Republic.
The constitutional debates, which strengthened the ties between socialists, radical socialists, and Republican Action, forced Lerroux's radicals and progressives to leave the alliance, leading to the formal end of the Republican Alliance.