The Axis powers were a coalition of countries that fought against the Allied powers during World War II. The major Axis powers were Germany, Italy, and Japan.

Operation Overlord was the code name for the Allied invasion of Normandy, which took place on June 6, 1944. The invasion was a major turning point in the war, as it led to the liberation of Western Europe from Nazi Germany.

The Battle of Midway was a decisive naval battle that took place in June 1942. The battle resulted in a major victory for the United States Navy and is considered to be the turning point of the war in the Pacific.

Little Boy was the code name for the atomic bomb dropped on Hiroshima, Japan, on August 6, 1945. The bomb caused widespread destruction and loss of life, and is considered to be one of the most significant events in human history.

Both Britain and France declared war on Germany on September 3, 1939, following Germany's invasion of Poland.

The Battle of the Bulge was a major German offensive in the Ardennes Forest in December 1944. The battle was the last major German offensive of the war, and resulted in a defeat for Germany.

The United States was the first country to develop an atomic bomb, which was successfully tested in July 1945.

Operation Z was the code name for the Japanese attack on Pearl Harbor, which took place on December 7, 1941. The attack brought the United States into World War II.

Italy was the first country to surrender to the Allied powers, in September 1943.

The Yalta Conference was a meeting of the leaders of the United States, the United Kingdom, and the Soviet Union, which took place in February 1945. The conference discussed the postwar order and the division of Germany.

Japan was the last country to surrender to the Allied powers, in September 1945.

The Treaty of San Francisco was the peace treaty that formally ended World War II between the Allied powers and Japan. The treaty was signed on September 8, 1951.

61 countries participated in World War II, either as members of the Axis powers or the Allied powers.

The estimated number of casualties in World War II is between 70 and 100 million, making it the deadliest conflict in human history.

The Soviet Union suffered the most casualties in World War II, with an estimated 20-27 million deaths.