Slavery was a legacy of our colonial past. We eliminated it with a great sacrifice of blood and treasure. We addressed segregation and racial strife. Today, America is far more tolerant than Europe when it comes to assimilation of minorities. It is not a matter of throwing stones. Many Europeans came to America to escape religious persecution and oppression.
Genocide is a loaded word. It was never the policy of the USG to eliminate all Indians. It was the policy of Nazi Germany to eliminate all Jews. To compare what happened to the Indians to the Holocaust is an insult to those who died by the millions in the concentration camps. America did not initiate WWI or WWII, which resulted in the deaths of more than 75 million. We did not give the world communism, facism or socialism.
Odd that much of the world rejects our model (at least on [paper) of a limited government and seeks to implement an all powerful government model of redistribution and controls.
The reason there weren't as many Indian dead as European dead in the World Wars is because there weren't as many Indians. The Cherokee Trail of Tears was genocide, pure and simple. It was an intentional death march, carried out by the United States Army, under the orders of the President of the United States, in the dead of winter, with the foreknowledge of the conditions and callous disregard (at BEST) for the certitude of a massive death toll among children, the ill and the ages. There were only a few thousands of Cherokee, so the 50% plus death rate does not rank in numbers with with what happened in Europe, but the malevolent, vicious and murderous intent of the national government was every bit as present in both places. The Cherokee were intentionally murdered, en masse, by being marched to death in the winter, by the President of the United States and the Army of the United States. The difference in scale was only due to the smaller overall numbers of Cherokee versus Jews in Europe. The barbarity of the US government in the act stands for what it was: genocidal.
Slavery was a legacy of the colonial past, which the US was perfectly willing to accept and exploit for four score and nine years, and then to maintain apartheid for another hundred. THAT was not the fault of the British. It was homegrown American evil, pur et dur.