Well, you are probably talking
about the wheel. Wheel actually existed in Americas but only in native toys. In
other continents, draft animals like the ox, cattle, camels, and horses are
available to pull loads and make invention of large wheels feasible. The only
large critter in Americas is the American Bison, which is almost impossible to
domesticate. The next big animal in Americas is the llama, which only existed
in the Andes regions and nowhere else.
