Why should Columbus be regarded as an American hero, not their founding president? Why is Columbus a myth?

Columbus first discovered America, then Europe began to immigrate to America, and then most of North America became a British colony. Then a man named Washington led the descendants of those immigrants to establish the United States and other countries, that is, the United States, and Washington became the founding president. This is Columbus, who has been dead for a long time ... American history speaks highly of him, because the United States is a country ruled by whites, their ancestors came from Europe, and Columbus discovered the American continent, so the descendants of these immigrants thank Columbus. History has always been written by winners, and it serves the ruling class.