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".
Fascism
The invasion of Poland by Germany was deemed unacceptable by Britain, France and their allies, resulting in their mutual declaration of war against Germany that was deemed the aggressor in the war in Poland, resulting in the outbreak of World War II. In 1940, Mussolini led Italy into World War II on the side of the Axis. Mussolini was aware that Italy did not have the military capacity to carry out a long war with France or the United Kingdom and waited until France was on the verge of imminent collapse and surrender from the German invasion before declaring war on France and the United Kingdom on 10 June 1940 on the assumption that the war would be short-lived following France's collapse. Mussolini believed that following a brief entry of Italy into war with France, followed by the imminent French surrender, Italy could gain some territorial concessions from France and then concentrate its forces on a major offensive in Egypt where British and Commonwealth forces were outnumbered by Italian forces. Plans by Germany to invade the United Kingdom in 1940 failed after Germany lost the aerial warfare campaign in the Battle of Britain. In 1941, the Axis campaign spread to the Soviet Union after Hitler launched Operation Barbarossa. Axis forces at the height of their power controlled almost all of continental Europe. The war became prolonged—contrary to Mussolini's plans—resulting in Italy losing battles on multiple fronts and requiring German assistance.
During World War II, the Axis Powers in Europe led by Nazi Germany participated in the extermination of millions of Poles, Jews, Gypsies and others in the genocide known as the Holocaust.