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Question:

One of the earliest political parties in the United States was the Federalist Party. Its decline is best explained by:

A its opposition to the War of 1812.
Explaination

The Federalist Party advocated a pro-British foreign policy and therefore opposed the War of 1812. This made the Federalists unpopular with many Americans; this unpopularity deepened when the war ended with American victory. The Federalist Party did advocate a strong central government; however, this position was not a key factor in the Party's decline. The Federalist Party did organize state political parties in states such as Connecticut, Delaware, and Maryland. Many members of the Federalist Party were pro-trade and pro-business, as many members were well-to-do businessmen.