Question

central and eastern europe experienced ethnic tensions in the early 1900s primarily because
similarity in cultures and traditions caused problems between ethnic groups.
military powers were unable to stop the conflicts between ethnic groups.
many ethnic groups shared unlimited amounts of territory.
many ethnic groups wanted their own nation - states.

Explanation:

In the early 1900s, the rise of nationalism led many ethnic groups in Central and Eastern Europe to desire their own independent nation - states. This aspiration for self - determination and nation - building caused ethnic tensions as different groups vied for territory and political power. Similar cultures and traditions would not typically cause problems; military power not stopping conflicts is a consequence rather than a cause; and ethnic groups did not share unlimited territory.

Answer:

D. many ethnic groups wanted their own nation - states