Regardless of whether or not Columbus actually "discovered" our fair nation (that had numerous peoples already living in it at the time), he was undoubtedly involved in the rape of the West Indies and a participant in the slave trade.
Columbus established Spanish colonies that forced natives to surrender gold to the crown.
Columbus led an expedition against the Taino people of Hispaniola.
Columbus enslaved native people and sent them to Spain.
We rightfully deplore the continuing government support of Confederate statues, even those of common soldiers who did not own slaves. However, for some reason various folks here at DU continue to support statues and other honors for Columbus, a man who was actually a slaver.
http://www2.fiu.edu/~cookn/cuneo1.pdf
http://www.nytimes.com/1989/11/04/opinion/l-slavery-and-colonialism-make-up-the-true-legacy-of-columbus-866089.html
https://www.britannica.com/biography/Christopher-Columbus/The-first-voyage#toc25449