Help me please it would be great

How w.e.b. dubois wanted to improve the social and economic situation that existed for african americans during the early 19th century?

Following archduke franz ferdinand's assassination, austro-hungarian leaders: a. aided the ottoman empire in its campaign to keep serbia under its control. b. executed nearly all prominent serbs living in austria-hungary c. threatened to invade serbia if serb leaders did not agree to a set of strict demands. d.. formed an alliance with great britain to protect austria-hungary from future attacks.

Brainliesttt !me : ) why were the eastern european countries attempting to break free of the soviet union?