In the U.S,Racial discrimination,especially for black people,can be found throughout the history and still exists so far.The root of it dates back to long ago.From intensive study,the passage identifies the roots of racial discrimination from the civil war.So in this passage,I’ll from the Black Codes before and after the Civil War,white supremacist views,and remnant of the slavery in the south and KKK aspects to analyze the racial discrimination in the U.S today.