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1940–1944 marks the middle years of World War II, a period of rapid military expansion, shifting fronts, and escalating civilian suffering. In Europe, the early years saw the fall of France, the evacuation at Dunkirk, and the Battle of Britain, while German and Italian forces extended occupation across much of Western Europe and parts of the Balkans. The conflict also spread to North Africa, the Mediterranean, and the Soviet Union. The Nazi regime intensified persecution and deportations, culminating in mass murder of Jews and other groups as part of the Holocaust.

In 1941, Germany launched Operation Barbarossa, opening the Eastern Front, and Japan attacked Pearl Harbor, bringing the United States into the war and expanding hostilities across the Pacific. The same year, Axis and Allied powers fought across multiple theaters, including North Africa, the Balkans, and Asia.

The turning points came in 1942–1943. The Soviet Union halted the German advance at Stalingrad and began pushing west. The Allies won the Battle of El Alamein in North Africa and began strategic offensives in the Mediterranean. In 1943, Allied landings in Sicily and Italy opened a new front in Europe, while resistance movements and the persecution of civilians continued in occupied territories.

1944 saw a major shift toward the Allied offensive on both sides of Europe. The Allied invasion of Normandy (D-Day) on June 6 established a Western Front, followed by rapid advances in France and the liberation of Paris. Soviet forces pressed on from the east, and Allied air campaigns intensified bombing of German targets. By the end of 1944, Axis positions were deteriorating, setting the stage for the final Allied victories in 1945.