Slavs
Slavs are an Indo-European ethno-linguistic group who speak the various Slavic languages of the larger Balto-Slavic linguistic group. They are native to Eurasia, stretching from Central, Eastern, and Southeastern Europe all the way north and eastwards to Northeast Europe, Northern Asia (Siberia), the Caucasus, and Central Asia (especially Kazakhstan and Turkmenistan) as well as historically in Western Europe (particularly in East Germany) and Western Asia (including Anatolia). From the early 6th century they spread to inhabit the majority of Central, Eastern and Southeastern Europe. Today, there is a large Slavic diaspora throughout North America, particularly in the United States and Canada as a result of immigration.
Ethnic demography of Kazakhstan
As explained above, the Slavic groups have been declining ever since the 1960s, due to low birth rates and high death rates. Germans are characterized by very high birth rates, but it is mostly due to the high proportion of rural population and the presence of conservative religious factions like Mennonites and Evangelical Lutherans among them.