How was the idea of self-determination affected by the peace treaties ?

"It was violated almost immediately" is the right answer.

Self-determination was a secret talking of president Wilson and the ideas behind the League of Nations. The principle of self- determination, often regarded as a moral or constitutional right is that each country is authorized to have a sovereign territorial state in which every identifiable community would decide the state with which they belong.

It was violated because not all the citizens got a country, and when the boundaries of nations were being rearranged many groups of people were forced to remain in different countries. Hence, it was violated almost immediately.

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he is known for discovering   the fossil of a female hominin australopithecine   known as "lucy" in the afar triangle region of hadar, ethiopia.

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