Answer: you did posted the answer choices
Explanation:
The Americans whowed great distste and hatered towards Japan of which lead to the entry of the US in WW2 and the Nuclear bombing of Hiroshima.
The answer is they "refused to ratify".
The League of Nations charter became part of the Treaty of Versailles following World War I. President Woodrow Wilson pushed hard for its passing, to the point that he earned the 1919 Nobel Peace Prize. However, when he brought the charter to the U.S. Congress, the members refused to ratify it. Thus, the international organization promoted by President Wilson never became a part of American politics.
Familiar Greek and Roman philosophical traditions were reconciled with Christianity as the educated Roman classes converted.
I'm not positive though.
Berlin Blockade: 1948
Korean War: 1950
NATO Formed: 1949
Truman Doctrine: 1947