Explanation:
1A. World War II (WWII or WW2), also known as the Second World War, was a global war that lasted from 1939 to 1945. It involved the vast majority of the world's countries—including all the great powers—forming two opposing military alliances: the Allies and the Axis.
2A. After the First World War the term "Baltic states" came to refer to countries by the Baltic Sea that had gained independence from the Russian Empire. The term includes Estonia, Latvia and Lithuania, and originally also included Finland, which later became grouped among the Nordic countries.
3A. The Soviet Union
The occupation of the Baltic states involved the military occupation of the three Baltic states—Estonia, Latvia and Lithuania—by the Soviet Union under the auspices of the 1939 Molotov–Ribbentrop Pact in June 1940.
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