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.
Aside from that, their differences are far more compelling, and it was these differences that keep causing trouble for the United States 200 years later. Adams was a lawyer and a yankee. He opposed slavery but believed in settling differences by legal means. Washington was a military man and a slaveholder. He believed in settling differences with battles and military alliances.