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Slavs are the people who live in Eastern and Central Europe, the Balkans, Central Asia and North Asia . They include: Russians, Poles,Macedonians, Czechs, Serbs, Ukrainians, Belarusians, Bulgarians, Slovaks, Slovenes, Croats and Bosnians.
Hungarians, Romanians, Lithuanians and Latvians live near the Slavic nations, but are not Slavs themselves. There are more Slavic peoples than any other ethnic group in Europe. Russians make up the most Slavs, followed by Poles and Ukrainians. Russians, Belarusians, and Ukrainians are East Slavic. Poles, Czechs, and Slovaks are West Slavic. However, the Croatians, Montenegrins, Macedonians, Slovenes, Serbs, and Bulgarians are South Slavic. Sometimes the West Slavs are grouped together with the East Slavs as the North Slavs, because they share borders and many cultural similarities with each other (the main difference is that the West Slavs are mostly Catholics, whereas the East Slavs are mostly Eastern Orthodox).
There are many small historic Slavic nations like Lusatia, Rusin, Kashubia and others. Russia is now the most powerful Slavic country, but in the 10th century the Czechs were more powerful, and in the 16th century Poland was the strongest nation in the area.
The Slavic languages are closely related. The largest similarities can be found within the same group (e.g. Polish and Slovak, both West Slavic languages), but similarities exist even between Slavic languages from other different subgroups (e.g. Polish and Russian, West Slavic and East Slavic respectively). However, the greatest similarities exist between Serbian, Bosnian and Croatian - these South Slavic languages are considered separate by the Bosnian and Croatian governments, but most linguists say they are one language called Serbo-Croatian. Slavic languages are spoken natively by 400 million people, and as second or third languages by many more people in countries as far apart as Germany and China.