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And follow the links for derivate items that you might not find in the main articles.
League of Nations was the precursor of the UN. It was created after WWI
by the winning powers. Due to the largest power, USA, not participating
it became quite ineffective.
Guess that Big 4 refers to USA, UK, France and Russia, the largest of the allied powers.
US President Wilson presented the 14 points that bear his name that
basically stated that nations (ethnic groups) had the right of
self-determination. This principle was only applied partly to the
crumbling Austro-Hungarian Empire and in few other cases. See: