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The Tripartite Pact , also known as the Pact of the Axis , was a pact signed in Berlin the 27 of September of 1940 by Saburō Kurusu , Adolf Hitler and Galeazzo Ciano , representing the Empire of Japan , the Nazi Germany and the Kingdom of Italy respectively . This pact constituted a military alliance between these nations, and the Axis Forces were officially formed , opposed to the Allied Forces in World War II .
In the following months, the kingdoms of Bulgaria , Hungary , Romania and Yugoslavia adhered to the pact - the first three to receive territory in the Balkans , and the last to avoid being invaded. The Slovak Republic also acceded to the Covenant after the dismemberment of Czechoslovakia .