The ancestors of living Native Americans arrived in what is now the United States at least 15,000 years ago, possibly much earlier, from Asia via Beringia. A vast variety of peoples, societies and cultures subsequently developed.
Answer:
the unjust or prejudicial treatment of different categories of people or things, especially on the grounds of race, age, or sex.
I'm pretty sure it was Thomas "StoneWall" Jackson.
It's said to be a subatomic particle that explains weak and electromagnetic interactions. It's named after Peter W. Higgs, a physicist. :)