Amerigo Vespucci. It would not take much effort to convince the marauding rabble that America itself is named after a guy that owned six million slaves that he turned into lampshades, and who was clearly an evil racist who hated feminists and homosexuals, was a climate change denier, drove a Hummer, ate red meat, and was a frequent guest on Fox News. Therefore "America" needs to be promptly re-named and any reference to it wiped from the books.
Try it. They'll believe it. The lemmings would not think twice.
It is also a cryin' shame that the Grand Canyon has miles of walls as yet unbeautified by spray paint. The Hoover Dam? Heck, that is a big blank canvas.