Because what happened in America happened on a systematically much larger scale with the objective of conquering a vast area through organized means, leading to demographic change of a nature not entirely comparable to a whole lot of other historical examples.
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As Meta pointed out, plenty of folks to blame. The Spainards managed to wipe out several civilizations in Central America and Mexico, and plop their own genetic profile in its stead. The Porteguese took care of those pesky natives in and around much of South America. The French wiped out most of the natives in Florida and what is now Central-Western USA, along with a healthy dollop of what is now Canada before the blood-thirsty Brits landed and began to wipe out those tribes along the east coast.
Of course the Brits were behind France, Spain and Portugal in the North-South American native-slaughtering business because they were stretched a bit thin, having to liberate an entire continent (Australia) from those naughty aboriginal folks, not to mention the effort it took for them to claim one of the most populated countries in Asia (India) as its own. This all happened long before there was any population known as "American", because it was long before there was even a country known as America or the USA.
So tell me again, why is North America... specifically the territory now known as the USA... being singled out for criticism and contempt here?
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I don't really have anything to add. Note that I never spoke a word of Englishmen or any American people. I reiterate: What happened in America happened on a systematically much larger scale with the objective of conquering a vast area through organized means, leading to demographic change of a nature not entirely comparable to a whole lot of other historical examples. I'm essentially talking about both North and South America, and the people ending up on the wrong end of said demographic change were the natives.
I really can't think of anything similar in the history of mankind; the only thing that would come close would be the forced immigration of Africans turned slaves, but that merely served to drain an already badly underpolutaed area further without any intent of keeping the territory for colonizing purposes. Sure, one shouldn't specifically "pick on North America," but the truth of the matter is that the point at hand is very much valid when it comes to the white man versus the natives in the New World on a larger scale than "the Yanks weren't as bad as some other people around the world."