To clarify; the text tells us that Wales was not colonised, but that The Vikings, did, however, begin to settle in the southwest around St. David's and Haverfordwest, most of Gower and Glamorgan and through raids Sweyne Forkbeard founded the modern city of Swansea.
Didn't just kill many Native Americans, he was responsible for the Trail of Tears-thousands of Native Americans died because of him. . In the first inaugural address of Andrew Jackson he said he would observe the Indian's rights which is a consistent habit of our government and the feelings of our people. Then turns around and forces Indians to move west because he found gold in there territory which at the time was Georgia.
He thus gave the common people more of a voice in the federal government.   Andrew Jackson was also the father of our modern banking system and his Indian policy m made the the Trail of Tears possible which forced Native Americans to leave the East Coast and go to Oklahoma. Jackson also averted a civil war.