Final answer:
The increased demand for American agricultural products following the War of 1812 resulted in a rise in demand for land in the U.S. to produce crops like cotton. This also contributed to a domestic slave trade and economic growth including expansion of manufacturing and trade.
Step-by-step explanation:
The direct result of the increased demand for American agricultural goods after the War of 1812 was B. a rise in demand for land in the U.S. This demand was driven by the need to produce more cotton and other agricultural products to supply the growing industry and international markets. The war had interrupted trade and forced Americans to develop a domestic market, thereby fueling the market revolution. Furthermore, the cessation of importation of slaves due to the abolition of the foreign slave trade in 1807 led to B. the rise of a thriving domestic slave trade to meet the labor demands of expanding agricultural enterprises. Additionally, the cotton boom contributed to various economic effects, including increased U.S. trade with countries like France and Spain, expansion of northern manufacturing, increased reliance on slave labor, and growth of port cities such as New Orleans.