America pursued the expansion of land so as to gain more land for themselves.
The United States had already done some large acquisitions of other places and had expanded greatly. They had expanded into the north to the 49th parallel, south to Florida and Mexico, and west to the Rocky Mountains through the Louisiana Purchase between Britain and Spain, in 1803 and treaties.
The political, social, and economic wave was the one that influenced the expansion. Through these expansions, some people had the opportunity of grabbing huge fertile lands for themselves. This was accompanied by nice ports along the Pacific Coast as sources of profitable business projections.
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