You obviously lack education and are just repeating SJW leftist dogma. Columbus never claimed to discovery of North America nor was that taught. He discovered a new world that stimulated exploration and eventually led to a connected world. Those who lived there were as oblivious to the old world as the old world was to the new. Columbus’ discovery by physically proving rumors began the connections of the world together.
Stop supporting Cesar, Alexander the Great, or any other historical explorer or conqueror figure. Tear down their statues? Stop supporting the Aztecs, Greeks, Romans, Incas, Gauls, mongols? Tear down the artifacts and destroy their ruins! They all did what you say Columbus did. Stop supporting essentially human history? Don’t talk about it because some of it was barbaric? It happened, it was often barbaric but it is human history and you want to ignore it because your 2020 SJW values.