Why was the Balkan region referred to as the “powder keg” of Europe prior to world war 1?

A. Nationalistic and imperialistic rivalries were increasing which caused stress with the alliance systems that many of the Balkan nations were members.

B. The aggression of the Ottoman Empire was disrupting the balance of power.

C. The area was the leading supplier of military equipment to the rest of the world.

D. Yugoslavia was invading its neighboring countries.

What two different approaches did the knights of labor and the american federation of labor take in building a union organization? a) the knights of labor accepted only unskilled workers; the american federation of labor accepted only skilled workers. b) the knights of labor accepted skilled and unskilled workers; the american federation of labor accepted only skilled workers. c) the knights of labor refused to accept african american or chinese workers; the american federation of labor accepted all workers. d) the knights of labor accepted workers from a single industry; the american federation of labor accepted workers from several industries.