Menzies
believes that in the year 1421 Chinese sailor are the first who arrived in America, 70 years earlier
than Columbus (Europeans).
Actually a scholar also
believes that
people from Asia who first set foot in America. Where that was 10,000 years ago or more, when the Asian people crossed over the Bering land bridge from Siberia(Alaska).
But in Menzies theories Chinese people are involved in trading and governance with the American.
Menzies also believes that the maps used by Europeans explorer that they used to navigate the globe are made by Chinese. Plenty of other artifacts show Chinese pre-Columbian occupation in Americas.