Speaking as a scientist, I feel I must weigh-in here. - It's bullshit. This is what goes for science today: lies and bullshit bolstering political expediency.
North America did not support 58 million indigenous people before the Europeans came en masse to this continent. This was a sparsely populated region of the world, primarily a hunterr-gatherer subsistence economy, with only very small/intermittent dalliances with agriculture throughout popularly-known history. Prior to the introduction of Western Civilization, the most Indians all of N. America ever supported at any one time was about 18-22 million.
Compounding this, around 1000-1200 A.D. the population of the entire continent was decimated by waves of disease. By the time the Europeans arrived, the entire population of Indians in all of North America was 8 million, with most of those living in the Northern (Canadian) regions. The more southerly Indians had been fighting both disease and each other to such an extent that they numbered only perhaps 2.5-4 million East of the Mississippi river, and another 1-1.5 million West of it. Again, these were sparsely populated regions in the first place, which had been decimated by two centuries of disease, and had been very slow to recover from that.
(The one exception to this, to the disease and intertribal warfare, was South of the Sonoran Desert (in what is now Mexico), where a civilization arose and fell in cycles. This area supported more people - perhaps as many 15 million.)
The constant blame and shame of the 'white man' for they did to the Indians of N. America is completely undeserved. With the introduction of Western Civilization, many tribes in the Eastern Americas married into the European pops, resulting in our own blended European-American genotype. (Because that population already had many European genetic characteristics, indicating some prehistoric populations exchanges across the Atlantic, it wasn't such a stretch for those people to be absorbed by the more advanced European newcomers.)
Further West, those populations were more tribally and racially segregated. The Athabaskanans (Navajos), for instance, were Northwestern interlopers who did NOT intermarry with the indigenous Hopi/Zuni, nor the Apaches/Utes, the Cherokee and Lakota. Each had their own strategies for civilization which did NOT mix well with the others. The European-Americans brought peace to the lawless areas they entered. And with that, with the introduction of European-American population, Indian populations slowly rose as well.
So, the 'science' of that article is just popular bullshit designed to make you feel guilty. It's a kind a mental warfare. Keep that in mind as you explore your own history - someone wants you to feel guilty. The real truth is that our history has everything to be proud of.
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