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.

The answer is D) many ethnic groups wanted their own nation-states.

Ethnic tensions in Central and Eastern Europe were caused by the tendency of different groups to have their own nation-states.

During the XIX and early XX centuries, nationalism was a key feature of the European ideological landscape. According to that ideology, every nation (defined as a group of people that shared a common language, history, customs, etc) had to have their own political organizations in the form of nation-states. Nationalism was one of the main reasons behind the start of WWI, which happened in The Balkans, after a Serbian Nationalist killed the heir to the Austro-Hungarian crown. The assassination was motivated by the desire of Serbian nationalists to separate from the Austro-Hungarian Empire and form their own State.

they supported black codes so the answer is a or b