How did the Louisiana Purchase affect slavery?

The Louisiana Purchase opened up a new can of worms in the United States—how much of the new territory should be open to slavery? By doubling the size of the U.S., the purchase added vast swaths of territory that, pro-slavery advocates argued, should be filled with slaves.Click to see full answer. Likewise, people ask, how did the Louisiana Purchase affect the United States?The Louisiana Purchase, made 200 years ago this month, nearly doubled the size of the United States. All or parts of 15 Western states would eventually be carved from its nearly 830,000 square miles, which stretched from the Gulf of Mexico to Canada, and from the Mississippi River to the Rocky Mountains.Beside above, how was the Louisiana Purchase unconstitutional? Although the purchase was thought of by some as unjust and unconstitutional, Jefferson determined that his constitutional power to negotiate treaties allowed the purchase of what became fifteen states. In hindsight, the Louisiana Purchase could be considered one of his greatest contributions to the United States. Considering this, what law banned slavery in the Louisiana Purchase? In 1820, amid growing sectional tensions over the issue of slavery, the U.S. Congress passed a law that admitted Missouri to the Union as a slave state and Maine as a free state, while banning slavery from the remaining Louisiana Purchase lands located north of the 36º 30′ parallel.Why was the Louisiana Purchase important?The Louisiana Purchase gave the U.S. control of the Mississippi River and the port city of New Orleans, both of which were used by farmers to ship their crops and get paid. It also ensured that France and probably other European countries would not try to take the land.