That is not accurate. The first colonies in North America were the Roanoke Colony (failed) and the Jamestown (successful) colonies of Virginia. These were founded by Sir Walter Raleigh and the Virginia Company of London respectively.
The colonies of Virginia engaged in absolutely fucking intense warfare with the Powhatan tribes of the region and almost completely eradicated them in order to turn their lands into tobacco plantations because the way natives practiced agriculture was not conducive to large scale tobacco production. You are wrong sir.
I recommend reading Charles C. Mann's 1493: Uncovering the New World Columbus Created for further clarity on the subject.
>i would like to note that these periods all happend without human intervention.
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I would like to note that you are incorrect.
And all of us who read about your error know it.
Now you can be educated also!
http://www.amazon.com/1493-Uncovering-World-Columbus-Created-ebook/dp/B004G606EY
http://www.amazon.com/1493-Uncovering-World-Columbus-Created-ebook/dp/B004G606EY
Here's an intro by the author. Super interesting