Major Alliances during World War II (1939-1945) There were two major alliances during World War II: the Axis powers and the Allied powers. The three principal partners in what was eventually referred to as the Axis alliance were Germany, Italy, and Japan. These countries were led by German dictator Adolf Hitler, Italian dictator Benito Mussolini, and Japanese Emperor Hirohito. In September 1940, the three countries formalized their alliance through the Tripartite Pact. Five other countries subsequently joined the Tripartite Pact and became Axis powers. They were Bulgaria, Croatia, Hungary, Romania, and Slovakia. Each of Germany’s six European Axis allies participated in the Holocaust by murdering Jews or by transferring them to German custody to be murdered. The Allied Powers were led by Great Britain, the United States, and the Soviet Union. These countries were led by British Prime Minister Winston Churchill, US President Franklin D. Roosevelt, and Soviet Premier Joseph Stalin. They formall
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