The Russian/Soviet Empire.
The Byzantine Empire.
Austria-Hungary
The Byzantium Empire.
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.
Due to the Ottoman Expansion into Eastern Europe where they defeated the Byzantine empire and took most of East Europe and some of Central Europe. Therefter people from other parts of the Ottoman empire came and settled in the Balkans.
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.