If an advanced civilization of American Indians had discovered a stone age Europe they would have done the same. Difference is they they would have brought those same European diseases back to the Americas wiping out much of their population.
“If an advanced civilization of American Indians had discovered a stone age Europe they would have done the same.”
Exactly. The Indians were conquered by the Europeans, just like cultures have been conquered since the dawn of mankind. The only difference is that Europeans had the means and the inclination to make decent records of it.