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12-/kloc-What was the result of German immigration to Czech Republic in the 3rd century?

12- 13 century, due to a large number of German immigrants, the Czech Republic formed a special social group composed of German feudal lords, urban nobles and mine owners. They colluded with the Czech feudal landlords and exploited the Czech people. Farmers and urban civilians, under the double oppression of nationality and class, "live in their own country like exiles".