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IOTL, El Salvador asked to join the United States in he 1820s, but was denied. During the Mexican-American War, the USA didn't annex the heavily populated parts of Mexico. These two instances were due, at least partly, to racism--they didn't want so many Hispanics in the USA. My question is, under what circumstances would El Salvador be admitted to the Union, and more broadly, how could we make it so that Central American, Caribbean, or South American nations could have the legitimate option of opting to join the USA? By this I mean either by opting to join or being invaded and annexed---either seem out of question IOTL due to the disinclination of the USA in accepting large Hispanic populations. I know very little on the subject, so any info would be appreciated.
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