Tripartite Pact Axis powers Hungary Slovakia Romania Romania Hungary territory ceded to the Soviet Union Germany Japan German Axis Soviet Union Italy
At the end of September 1940, the Tripartite Pact formally united Japan, Italy, and Germany as the Axis powers. The Tripartite Pact stipulated that any country, with the exception of the Soviet Union, which attacked any Axis Power would be forced to go to war against all three. The Axis expanded in November 1940 when Hungary, Slovakia, and Romania joined. Romania and Hungary later made major contributions to the Axis war against the Soviet Union, in Romania's case partially to recapture territory ceded to the Soviet Union.
