Question

why is U.S.S.R called Russia today?

Answer 1

Russia and USSR aren't interchangeable terms. Union of Soviet Socialist Republics (USSR)  was a former union of multiple sub-national republics that existed between 1922 and 1991 on the Asian and European Continents. 

After its dissolution, the Russian Federation (formerly the Russian SFSR) assumed the Soviet Union's rights and  obligations and is recognised as its continued legal personality. Russia is the successor state of the Soviet Union. Hence, referring to Russia as USSR is technically incorrect.

Answer 2

Answer:

Both the terms are informally used the term, but actually Soviet Union was the term used instead of USSR (Union of Soviet Socialist Republics) whereas the term Russia was a statue in it. Russia is a part of the Soviet Union; people think that the Soviet Union is Russia because it was the largest country of the USSR.In the English-speaking world, the Soviet Union was also informally called Russia and its citizens Russians, although that was technically incorrect since Russia was only one of the republics of the USSR.

Explanation:

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