During the 1930's the leaders of japan, germany, and italy made war more likely by
a)engaging in submarine warfare.
b)refusing to join the league of nations.
c)required that the losing nations in w. w. i pay reparations.
d)using nationalism to establish warlike attitudes among their populations.

During the 1930s, the leaders of Japan, Germany, and Italy made war more likely by using nationalism to establish warlike attitudes among their populations - D.

These nations managed to make a very uneasy atmosphere around the world because of their general attitude on how they wanted for the world to be run.