António de Oliveira Salazar
Despite the authoritarian character of the regime, Portugal did not experience the same levels of international isolation as Spain did following World War II. Unlike Spain, Portugal under Salazar was accepted into the Marshall Plan (1947–1948) in return for the aid it gave to the Allies during the final stages of the war. Furthermore, also unlike Spain, it was one of the 12 founding members of the North Atlantic Treaty Organisation (NATO) in 1949, a reflection of Portugal's role as an ally against communism during the Cold War in spite of its status as the only non-democratic founder. In 1950, Portugal joined the European Payments Union and participated in the founding of the European Free Trade Association (EFTA) in 1960 and the Organisation for Economic Co-operation and Development in 1961. It joined the General Agreement on Tariffs and Trade in 1962, and finally, Portugal signed a free trade agreement with the European Economic Community in 1972, still under the auspices of the "Estado Novo".
Continental System
Portugal openly refused to join the Continental System. In 1793, Portugal signed a treaty of mutual assistance with Britain. After the Treaty of Tilsit of July 1807, Napoleon attempted to capture the Portuguese Fleet and the House of Braganza, and to occupy the Portuguese ports. He failed, as king John VI of Portugal took his fleet and transferred the Portuguese Court to Brazil with a Royal Navy escort. The Portuguese population rose in revolt against the French invaders, with the help of the British Army under Arthur Wellesley, later 1st Duke of Wellington. Napoleon intervened, and the Peninsular War began in 1808. Napoleon also forced the Spanish royal family to resign their throne in favor of Napoleon's brother, Joseph.