And do a little research -- the vast majority of American Indian deaths came from imported diseases, not from genocide.
Indians were mistreated, they were cheated, but they were not slaughtered wholesale. The scale is absolutely incomparable: The famous Wounded Knee Massacre of Lakota Sioux by the US Cavalry killed between 200 and 300 men, women and children; Lists of reported massacred Indians total about a thousand dead over 60 years.
Meanwhile, the Nazi machine killed on average 6000 prisoners PER DAY.
And you wonder why you aren't taken seriously?