Soviet Union, Poland, East Germany, Czechoslovakia, Hungary, Yugoslavia, Albania, Bulgaria, and Romania.
They were known as Iron Curtain Countries
There never was an Eastern Europe Empire.
The Russian/Soviet Empire.
Austria-Hungary
The Byzantium Empire.
The religion of the eastern empire was Orthodox Christianity.
It grew from Western Europe to Eastern Europe, then collapsed to Eastern Europe.
It grew from Western Europe to Eastern Europe, then collapsed to Eastern Europe.
It grew from Western Europe to Eastern Europe, then collapsed to Eastern Europe.
The Austrian Empire was associated with having control of Eastern Europe.
Most of Eastern Europe, including Poland (:
Because the Soviet Union controlled Eastern Europe for four decades. This changed when they elected a new leader, Mikhail Horbachev, he gave Eastern Europe more freedom as one of his reforms.
The Roman Empire.