The characteristic of the economic theory of mercantilism is that, exports should be encouraged over imports. The economic theory of mercantilism's main aim is to establish a powerful and wealthy state. Mercantile system is a kind of economic system that seeks to enrich a country be prioritizing and encouraging exports over imports.
Fort Sumter in South Carolina
Virginia
I need more words to post this answer so
The answer to your question is,
B. Technology made manufacturing more efficient.
-Mabel <3
During the ensuing decades, the abolitionist movement grew in Northern states, and Congress regulated the expansion of slavery as new states were admitted to the Union. Britain banned the importation of African slaves in its colonies in 1807 and abolished slavery in the British Empire in 1833.