Manifest Destiny was largely led and carried out by white americans seeking the westward expansion to increase the boundaries of the United States. African Americans were impact largely because as westward expansion continued new states were brought into the union with legalized slavery in places like Texas. This had an overall negative impact on African Americans by increasing the demand for slavery and expanding the institution of slavery westward. For the Native Americans Manifest Destiny was a major catastrophe leading to the ethnic cleansing and removal of Native Americans from their homes and lands. This removal often occurred with force with high rates of violence.
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One of the most important rules to the Native Americans was that land was to be used by tribes regardless of whether or not it was "worked" in the traditional European sense. This led to great conflict with the Europeans, who thought the Natives weren't entitled to the land if they did farm on it.
Group? Maybe?
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Choice A is wrong because only 26 presidents have served in the military.
Choice B is wrong because not all presidents have been governors.
Choice D is wrong since James Buchanan and Grover Cleveland were not married.
Therefore, Choice C is the correct answer.