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Islam is the second strongest religion after Orthodox Christianity on Balkans.
Before Orthodox Uprisings it was Primary religion for several hundred years.
The majority of Balkan muslims were Greeks who were later after 1920 exchanged for Anatolian Orthodox population.
After them 2nd place are South Slavs then Albanians as unique group.
Since 1820 till today: Greece and Serbia have removed their Muslim populace by moving them to Turkey, while
territories like Bosnia, Albania kept their muslim populace since they were majority.
Bulgaria had a significant muslim populace as well, but I know little about them.
Modern Turkey hosts from 4-10 million Balkan Muslims, without counting Anatolian Greek converts.
This is 2010 Balkan Muslims Map:
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