When most people think of World War II, they think of the Allied power of the United States, the United Kingdom, and the Soviet Union, versus the Axis power of Germany, Italy, and Japan.

However, this wasn’t always the case. At the start of the war in Europe, Nazi Germany and the Soviet Union actually coordinated with each other to invade their neighbors.

Learn more about the Ribbentrop-Molotov Pact.
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