The Estado Novo was the corporatist Portuguese state installed in 1933. It evolved from the Ditadura Nacional formed after the coup d'état of 28 May 1926 against the unstable First Republic. Together, the Ditadura Nacional and the Estado Novo are recognised by historians as the Second Portuguese Republic. The Estado Novo, greatly inspired by conservative and autocratic ideologies, was developed by António de Oliveira Salazar, who was President of the Council of Ministers from 1932 until illness forced him out of office in 1968.

The Portuguese Empire, also known as the Portuguese Overseas or the Portuguese Colonial Empire, was composed of the overseas colonies, factories, and later overseas territories, governed by the Kingdom of Portugal. It was one of the longest-lived colonial empires in European history, lasting almost six centuries from the conquest of Ceuta in North Africa in 1415, to the transfer of sovereignty over Macau to China in 1999. The empire began in the 15th century, and from the early 16th century it stretched across the globe, with bases in Africa, North America, South America, and various regions of Asia and Oceania.