Portugal during World War II
Upon the start of World War II in 1939, the Portuguese Government announced on 1 September that the 600-year-old Anglo-Portuguese Alliance remained intact, but that since the British did not seek Portuguese assistance, Portugal was free to remain neutral in the war and would do so. In an aide-mémoire of 5 September 1939, the British Government confirmed the understanding. As Hitler's occupation swept across Europe, neutral Portugal became one of the Continent's last escape routes. Portugal managed to remain neutral throughout the war despite extraordinary pressures from both sides, notably over the strategically located Azores islands and over the wolfram (tungsten) trade.
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.