What contributions did early American civilizations amke to present-day life in the United States?

Question

I need to know what contributions.

Answer 1

Hello dear Carla!
The unfortunate issue is that the invaders exterminated everything, thus just by archeology we could find out their progress!
The had an environmentally fine life and keeping mother Earth in great condition, while the invaders destroyed everything, without needing to do so, just for fun they were killing all kinds of animals, burning forests and villages, ...
How could we see anything from those times, since there are no pure, free, independent Americans any more?