Fascinating animated map of USA immigration; pre-1700 USA culture almost obliterated

Fascinating animated map of USA immigration, https://www.youtube.com/watch?v=jDN6ykZO0kI, 3 min. 45 secs, published Nov. 2015.
"Today more than 1 in 8 Americans are immigrants & almost all are descendants of immigrants.
Less than 2% of the US population have native American ancestors."
Ravi: I think USA (and perhaps Canada & Australia) may perhaps be the rarest of the rare countries in the world today whose culture & civilization/communities prior to the eighteenth century (pre 1700) seems to have been almost OBLITERATED by overwhelming numbers of (foreign) immigrants from the eighteenth century onwards.
The European colonial era that many countries of Asia and Africa suffered from, perhaps from sometime around the middle of the eighteenth century till around the middle of the twentieth century, very fortunately, could not obliterate the culture & civilization/communities of most, if not all, of those countries of Asia & Africa that came under European colonial rule. [Bulk of India came under military domination of the British in 1818 with the British decisively defeating the Marathas who were the major power in India then (the Mughals had declined in power by then); India freed itself from the British colonizers in 1947. Many countries of South America too faced military domination by European powers (mainly Spain & Portugal, I believe) but I know very little about colonization history of South America.]

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