The fordney-mccumber act, emergency quota act, and rejection of the league of nations are all examples of what growing sentiment?

They are all examples of growing isolationism.
After the the WWI there was a sense among many Americans that there was nothing gained for their intervention in the WWI. They wanted to distance themselves from the political bickering of the European nations and these three actions are the result of those wishes. This unfortunately lead to the weakening of the League of Nations and increased aggression of the future Axis states.

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From mexican american war , us gained new mexico.