#USA: We're Living in a Racial Caste System Designed to Divide Us, Benefiting No One but those in power.
To control the black slaves easier masters gave white slaves privaliges so they started acting as being part of the side who is in controle.

https://www.youtube.com/watch?v=lLgIIjnpZyU

History is a weapon.
"A People's History Of The United States
by Howard Zinn"
"http://www.historyisaweapon.com/zinnapeopleshistory.html"