Why was the purchase of Alaska a good move?

Purchase of Alaska, 1867. The purchase of Alaska in 1867 marked the end of Russian efforts to expand trade and settlements to the Pacific coast of North America, and became an important step in the United States rise as a great power in the Asia-Pacific region.

Explanation:

the answer is a. laws were enacted in the aftermath of the plot to make it harder to free slaves,increasing sectionalism

b - those executed came from every social and economic class