The first Eastern European country to demonstrate that the Soviet Union was losing control over the countries in its "sphere of influence" was

Question

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In 1980, Poland saw the emergence of an independent trade union called Solidarity, which challenged the communist government's authority and received support from other countries, including the United States. This marked a significant breakdown in Soviet control over its eastern European satellites and an indication of the Soviet Union's declining power in the region.

The First Eastern European Country to Demonstrate That the Soviet