The correct answer to this open question is the following.
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The treaties that settled the conflict referred to in the passage most directly change the Geopolitical structure of the middle east in the following way: "Allied Powers received territorial mandates from the League of Nations."
The League of Nations was formed after World War I in order to prevent another armed conflict. It was the precursor of the United Nations. United States President Woodrow Wilson was one of the most important supporters of the idea although, in the end, the United States decided no to be part of the League.
The reason was that European Allies did not accept the terms of Wilson's Plan. More than peace, European countries such as France and Great Britain wanted revenge and forced Germany to pay for war retributions.
The League of Nations was a forum to resolve disputes among member countries. Through its charter, member nations pledged to act collectively against any country that attacked a member country.