Question

What caused the balkanization of Czechoslovakia and Yugoslavia?

a)earthquakes
b)ethnic conflict
c)impassable mountain ranges
d)use of two different alphabets

Answer 1

At a guess, I'd say b ethnic conflict ... that seems to have had something/a lot to do with the outbreak of world war 1.

Answer 2

B.) Ethnic Conflict caused the balkanization of Czechoslovakia and Yugoslavia

Hope this helps!