You need to sue whatever school you attend for failure to educate you.
The GOP was founded in 1854 by opponents of the Kansas–Nebraska Act, which allowed for the potential expansion of slavery into certain U.S. territories. The party supported classical liberalism, opposed the expansion of slavery, and supported economic reform. Not what I would call "communist tyrants".
Lincoln never owned slaves. He was always an abolitionist and believed Blacks should be free, but he did not think them equal.
Robert E. Lee did own slaves and was considered mean and cruel. He broke up slave families and had his slaves whipped.
The Civil War was about more than slavery, but the issue of slavery was a significant issue.