When a war occurred in 1812 in the United States, the effect was the growth which was experienced by the economy. Hence, Option D is correct.​
What was the war of 1812?
The new United States faced off against Great Britain in the War of 1812, from which the American colonies had gained independence in 1783. The conflict resulted from a larger struggle between France and Great Britain over control of Europe and the rest of the world.
The United States entered the war in 1812 for a variety of reasons, including British meddling in its trade and the recruitment of its mariners. The desire to expand colonization into Indian, British, and Spanish areas, and ambitions to annex Canada and oust the British from North America. The United States and Great Britain engaged in a war over British infringement of American maritime rights.
Thus, Option D is correct.​
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