For those of you who are comparing the Jewish, Chinese, Native American, and other murders, exterminations and genocides; NONE lasted as long as the genocide of the Native Americans. NONE were even close. The Native American enslavement and extermination went on for at least 400 years. I would bet no other genocide, extermination (call it as you will) could come close to the numbers of lives taken either.
Not to take away from your point , but to also mention It amazes me when anyone brings up the subject of Genocide we all forget the atrocities of Pol Pot and the Khmer rouge from '75-79 they murdered approx 2.5 million ... And the world just stood by and let it happen. Other genocides the world has tried to forget, yet most only mention Germany in conjunction with these atrocities, not that one is worse than another they are all bad but lets not also forget the following:
Mao Ze-Dong (China, 1958-61 and 1966-69, Tibet 1949-50) 49-78,000,000
Jozef Stalin (USSR, 1932-39) 23,000,000 (the purges plus Ukraine's famine)
Adolf Hitler (Germany, 1939-1945) 12,000,000 (concentration camps and civilians WWII)
Leopold II of Belgium (Congo, 1886-1908) 8,000,000
Hideki Tojo (Japan, 1941-44) 5,000,000 (civilians in WWII)
Ismail Enver (Turkey, 1915-20) 1,200,000 Armenians (1915) + 350,000 Greek Pontians and 480,000 Anatolian Greeks (1916-22) + 500,000 Assyrians (1915-20)
Pol Pot (Cambodia, 1975-79) 1,700,000
Kim Il Sung (North Korea, 1948-94) 1.6 million (purges and concentration camps)
Menghistu (Ethiopia, 1975-78) 1,500,000
Yakubu Gowon (Biafra, 1967-1970) 1,000,000