One of their biggest arguments was whether or not the USA should join the League of Nations
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Answer:
The United States had more people in the territory than Britain and the United States was not looking for war with Britain when Mexico was ready to fight.
C) populism
For future reference: an easy way to remember the causes is to use the acronym MAIN (as in the MAIN causes) to remember that they are militarism, alliances, imperialism, and nationalism.
Hope this helps :)