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Largely due to ethnic and religious conflict. Eastern Europe has a large number of ethnic groups that often come into conflict. Lands that are predominantly Christian and lands that are predominantly Muslim also border each other here.
The two groups of Roman soldiers were the infantry and the cavalry. Each group had its divisions.
West Semitic people from the eastern coast of the Mediterranean (where Phoenician and Hebrew groups lived) are usually credited with developing the world's first alphabet.
Population pressure on the land. In western and central Europe population growth was pushing various people southwards. In eastern Europe land was squeezed by the expansion of the Huns. This phenomenon has been called the 'migration movement.'
The revolt is referred to as the Reformation, an attempt by Christian groups to reject some practices that had developed in the Roman Catholic faith.
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Europe
one of the oldest ethnic groups in Easter Europe is Albanians
Balts, Bulgars, and Romans.
There are many opposing ethnic groups in Eastern Europe. Their feuding has led to many wars.
national origin
There are hundreds of ethnic groups in Eastern Europe. The largest would have to be the Russians, the Ukrainians, the Romanians, the Greeks, and the Turks. Large immigrant ethnic groups would be such as Chinese, Afghani, Pakistani, and Indian.
It let the ethnic groups have there own independence and freedom
During the Roman times many groups of people fled into Europe to escape various hordes like the mongols and the huns, In most cases the Romans wouldn't let them into their land, and they owned all of western and central europe, so they would have to live on the border in eastern europe.