And the history of the Indians in the U.S. is not comparable to the Holocaust. That is an ignorant statement.
For the affected individual victim it was irrelevant if its murderers were Americans or Germans. Nevertheless you are right, that the Holocaust was indeed unique because this was the first time that factories were used to exterminate people. A nameless perfidy. In difference to the incidents in America (north and south) the extermination of the Jews was planned as a complete extermination (in German “Endloesung”). This does not change the fact that the Holocaust was not the first murder in large scale. One of those genocides was indeed the extermination of Indians who claimed their inherited land that was needed by American settlers to survive in that time. A reference:
http://en.wikipedia.org/wiki/Trail_of_Tears
The thing is that neither you as a American born in the 20th century (and therefore free from any guilt for the expulsion and genocides on American Indians) nor I as a German that was born in 1967 (and therefore free from any guilt for the Holocaust) can be hold responsible for occurrences that were caused by criminal countrymen a long time ago.