The answer is A. Ethnic groups
Manifest destiny was the reason the US claimed Oregon country.
Answer:
In Lincoln's mind, the railroad was part of the Civil War effort. The new line would support communities and military outposts on the frontier. ... A transcontinental railroad, Lincoln hoped, would bring the entire nation closer together – would make Americans across the continent feel like one people.
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The French-Indian was extremely costly. It left Britain with a huge debt. The British thought the colonists were to pay the debt because they were defending the colonies from the French. Britain also maintained a standing army in American colonies which was a huge financial stress. As a result, Great Britain taxed the colonies.
