A - Missouri Compromise
The Missouri Compromise allowed a balance between slave and free states, thus indicating the answer to the question.
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North Carolina’s railroad lines grew rapidly in 1860
Answer:
Theodore Roosevelt is often considered the "conservationist president." Here in the North Dakota Badlands, where many of his personal concerns first gave rise to his later environmental efforts, Roosevelt is remembered with a national park that bears his name and honors the memory of this great conservationist.
The correct answer is to protect domestic businesses.
When the US government puts a tax on an imported good (aka a tariff) they are trying to protect American businesses. The US government, when it passes tariffs, believe that the increased price of foreign goods with result in citizens buying goods from American made companies, as they will be similar in price or cheaper. This strategy has been used by the United States since the early 1800's and continues to be used as a means of protecting American businesses.
However, the succeess of these types of tariffs are mixed, as this usually results in a decrease in trade and an overall increase in price for consumer goods.