How did white supremacy, including segregation, as well as Black resistance and empowerment define the social, political and economic context of the United States during the late 19th and early 20th century, either by practice or by law?

How did white supremacy, including segregation, as well as Black resistance and empowerment define the social, political and economic context of the United States during the late 19th and early 20th century, either by practice or by law? Explain