There are plenty of valid claims that many other civilizations contacted America: https://en.wikipedia.org/wiki/Pre-Columbian_trans-oceanic_co... But it is meaningless since they did not write about it nor they stablished commerce. The fact is that before 1492, most civilizations in Africa/Asia/Europe did not know that America existed and that other humans lived there. After 1492, that changed forever.
I find it highly likely that crucial bronze age inventions like smelting, Eridu/Elamite 'pyramids' and writing were introduced to America in one way trips between 4000 and 0BC, however until we find artifacts or mummy DNA it's pure speculation.
Civilizations around the world definitely acquired similar technology with suspicious timing, but the common factor doesn't need to be humans. One theory I'm fond of is river deltas. The major ones all formed around 7,000 years ago (see https://www.youtube.com/watch?v=A47ythEcz74) as a geological result of the end of the ice age. After humanity spread to the Americas during the ice age, the end of the ice age seems to have created the conditions necessary for agriculture to flourish. Once you have agriculture you get cities, writing to track harvest numbers, pyramids from laborers working in the off season, and metalworking from craftspeople .