The main countries that fought on the Axis side (at least for part of the war) were Germany, Japan, Italy, Hungary, Romania, Bulgaria and Thailand.
In some cases, countries who were occupied (such as Vichy France) cooperated with the occupying forces and fought the Allies, at least until the Axis armies had been removed.
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The US joined them; Britain, Russia (Soviet Union), Canada, Australia, New Zealand, China, were already at war.
The United States of America.
The United States
United States and Russia
United States
The United States and the Soviet Union