It's true, the US committed genocide against Native Americans. That is obviously morally wrong. We haven't been doing that in the 20th or 21st centuries though.
The US has committed genocidal war against Koreans and Vietnamese and Afghans and Iraqis among others in the 20th and 21st centuries.
The US has committed genocidal war against Koreans and Vietnamese and Afghans and Iraqis among others in the 20th and 21st centuries.