The Philippines didn't want to be a part of the USA. Remember, territories have to apply for admission to the Union, and the Philippines were overwhelmingly in favor of independence, just as they had been ever since the Americans replaced the Spanish as the colonial power.
The USA was simply too racist back then to allow Philippines representation in the US Congress. The population of the Philippines in 1945 would've made up more than 10% of the American total population were the Philippines incorporated as a new state - American racism could've never allowed such a thing.
The only real true reasons is that some people in the US believed we were doing to the Philippines what the British did to us and we fought with them to get our own independence so why should we try to take away someone else? And America was built on self-government, not really having anything at first, so the Phillippines have the ability and should have the oppurtunity to do the same. If America is built on freedom and independence, standing for just those, then why are we trying to take someone elses? We're doing the opposite of what we stand for, when John Quincy Adams gave a speech about how America was not a conquering monster. (July 4th, 1821- Speech to the House of Rep.)
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