The Axis powers consisted of Germany, Italy, and Japan, who fought against the Allied powers during World War II.

Operation Overlord was the codename for the Allied invasion of Normandy, which took place on June 6, 1944.

Joseph Stalin was the leader of the Soviet Union during World War II and played a key role in the Allied victory.

The Battle of Midway, which took place in June 1942, is often seen as the turning point of the war in the Pacific, as it marked a major defeat for the Japanese navy.

Little Boy was the name of the atomic bomb dropped on Hiroshima, Japan, on August 6, 1945.

Auschwitz-Birkenau was the largest Nazi concentration camp and extermination center, where over one million Jews were killed during the Holocaust.

The United States remained neutral during most of World War II but eventually joined the Allied powers after the attack on Pearl Harbor in December 1941.

Operation Pearl Harbor was the codename for the Japanese attack on the U.S. naval base at Pearl Harbor on December 7, 1941.

The Battle of Stalingrad, which lasted from July 1942 to February 1943, is considered the longest and bloodiest battle of World War II.

Operation Pointblank was the codename for the Allied strategy of bombing German cities to weaken their industrial capacity.

The United States was the first country to develop an atomic bomb during World War II, with the Manhattan Project.

Operation Husky was the codename for the Allied invasion of Italy in September 1943.

Japan was the last country to surrender in World War II, on September 2, 1945, after the atomic bombings of Hiroshima and Nagasaki.

The United Nations was formed after World War II to promote peace and cooperation among nations.

The Jews were the main target of the Nazi's Final Solution, which aimed to exterminate the Jewish population of Europe.