Slavery in the United States was the legal institution of human chattel enslavement, primarily of native Africans and African Americans, that existed in the United States of America from the beginning of the nation in 1776 until passage of the Thirteenth Amendment in 1865. Slavery had been practiced in British America from early colonial days, and was legal in all thirteen colonies at the time those colonies formed the United States. Under the law, an enslaved person was treated as property and could be bought, sold, or given away. Slavery lasted in about half of U.S. states until 1865. As an economic system, slavery was largely replaced by sharecropping and convict leasing.
One, it created two new states.
Two, it was passed because of the Missouri compromise, because the Missouri compromise was declared unconstitutional. It made it where States entering the Union had to be slave free.
Three, it caused small acts of terrorism in Kansas, most notably, the burning of Lawrence, K.S.
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Most people were engaged in agriculture as in the U.S. in 1820. They
farmed to feed and clothe themselves; in other words, they engaged in
subsistence agriculture. Most people did not own land. The land was
owned by a few, such as hacendados or the Roman Catholic Church.
There
were export sectors in economies. Exports were of two basic kinds:
agricultural and mineral. Argentina and Uruguay exported cattle hides
and salted beef. Bolivia exported silver and mercury; Peru: silver and,
later, guano; Colombia: precious metals and sugar; Brazil: sugar and,
later, coffee; and Mexico: silver, gold, and cotton. Most of these
exports went to Europe. Little went to each other. None of it in huge
volumes even in Argentina until the late 19th century. The countries
lacked capital, communications networks, and technology to develop the
export business. Besides, the upper class was able to meet its needs
without much economic expansion. Societies were run for the benefit of
the upper classes.