Which situation was a major result of World War I (1914 - 1918)?

Answer 1

The League of Nations.

Answer 2

WWII - the treaty was so onerous to Germany [ thanks mostly to France ] that resentment and retribution began quickly.

Herr Hitler promised a ' chicken in every pot' type of solution and was warmly received.  He started programs in defiance of the treaty but no other country called him on it.