The correct answer is Mexico.
Because of Mexico and their gulf of Mexico, the United States cannot control the entire gulf area. If the area changed hands and went to the United States, they could unite the two gulfs and have a huge control over the land and the ports in the new world. However, that's probably never going to happen so it stays this way for now.
The concept of "normalcy" was based on nostalgia for an earlier America. The idea of nostalgia was new in Americans and since America was a new country, the forefathers wanted progress and did not want to look back in the past mentality.
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