It hurt the south for a while, slave labor was good for the south's economy but bad for competition up north because nobody could find a job if all the slaves worked for free. The removal of slavery cemented this competition-based method into America.
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according to what i read on a book the Ku Klux Klan was made when South America losed the War with Norht America and the North America made liberty to the black slaves (ahem do not mind the racism), after that the slaves became like some kind of rogues and began attaking and robbing people, some robbed for food to sustain family and others because they want to, then there is when the Ku Klux Klan (also known as KKK) came and attaked or killed those freed black slave wiping them out.
it is all i can write
They increased antisemitism, increased trade, weakened power of the church, weakened feudalism, and increased learning. The crusades also exposed the Europeans to Muslim advancements in math, literature, art , and geological knowledge.
He does not just happen to attend; he was the first one to receive a personal invite from Gatsby's butler. After that, he begins to form a friendship with Gatsby and goes to his parties regularly. Hope that helps :/