Final answer:
The Soviet Union consisted of 15 states with Russia being the most powerful member in terms of size, population, and influence.
Explanation:
The Soviet Union and Its Member States
The Soviet Union was composed of 15 states which were formed into a federated structure, with Moscow as the center of power. Among these states, Russia was considered the most powerful due to its size, population, and influence.
After the dissolution of the USSR in 1991, the former Soviet republics became independent countries, with Russia as one of them, leading to significant geopolitical changes in Eastern Europe and Eurasia.
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