According to the Grand Canyon Egyptian Cave Theory, this is how the Egyptian dominions may have looked like in the Mississipi before Columbus arrived in the New World

The Grand Canyon Egyptian cave is the name commonly given to a front-page story published by the Arizona Gazette on April 5, 1909, claiming that a Smithsonian-backed expedition had discovered an immense cavern complex high in the Grand Canyon whose chambers contained mummies, hieroglyphs and other artifacts of purported Egyptian or “Oriental” origin. Subsequent reviews by journalists, librarians, park staff and historians have found no evidence that the expedition occurred, that the named participants ever existed, or that any such cave was documented by authorities. The Smithsonian Institution has repeatedly stated it has no records of the people or project described, and modern reporting characterizes the episode as a local hoax that later fed into internet-era conspiracy theories about suppressed archaeology and alleged cover-ups.