[Hacksaw]

Likely. You should take a look at the pictures of stone and clay tobacco pipes found buried in Mounds throughout the Ohio Valley.

Weren't those built by the Adena tribe? I don't think they had anything to do with the Mayans, who would (IMO) left something more complex than a mount of dirt.

[muawiyah]

Would they? The Mayans in Yucatan lived in a karstland. Stick those same folks on top of lateric top soils surrounded by gigantic pine forests they would probably build some other way.

There are several different cultures of Mound Building in the Ohio Valley and Central South ~ including folks who were neither Adena nor Hopewell but were still building mounds when De Soto visited (1541).

The Cherokee rightly denied having built older mounds ~ they lived much further West and were new arrivals in the Southern Appalachians.