China discovered America?

A Chinese lawyer claims to have map, dated in 1763, copied from another map, which was dated in 1418. The map clearly depicts the Americas and Australia. Have a look:










The age of the map is being checked for authenticity and the results will be known in February. I am crossing my fingers that it's a hoax. Here is my train of thought: We only get ten paid federal holidays. Will I be working Monday, October 9th?