Carnation Revolution: A leftist military coup in Portugal overthrows the authoritarian-conservative Estado Novo regime.

The Carnation Revolution, code-named Operation Historic Turn, also known as the 25th of April, was a military coup in Portugal by officers that on 25 April 1974 overthrew Marcelo Caetano and the Estado Novo regime established by António de Oliveira Salazar. The coup came in the midst of the Portuguese Colonial War (1961–74) in its overseas colonies and produced major social, economic, territorial, demographic, and political changes in Portugal and in Angola, Guinea-Bissau, Mozambique, and other former Portuguese colonies through the Ongoing Revolutionary Process. It resulted in the Portuguese transition to democracy and an end to the Portuguese Colonial War. It also had worldwide repercussions by marking the beginning of the third wave of democracy.