Should not be a surprise.
http://www.nickscrusade.org/chinas-age-of-discovery-the-voyages-of-zheng-he/
China was everywhere except north america.
They have some maps that pre-date Columbus that depicted North America so they made it here too.
Pre-Colombus map from China.
Wasnt there pots found in California from China?
A statement open to mis-interpretation. China had small trade going on with the west coast of North America, in the late 600's A.D. There are ancient Chinese documents of such trade from that period, describing flora and fauna of what is now Mexico. That's 800 years before Europeans explored.