Because in American history, blacks appeared as slaves from the beginning, and their status was very low. It was dirty triangle trade who brought a lot of blacks from Africa, took away a lot of wealth and raw materials from America and returned to Europe for industrial production. Although the status of black Americans has gradually improved, it cannot be changed. From the beginning, African-Americans were slaves. Nowadays, various concepts of civil rights are constantly improving, and various rights protection organizations are constantly appearing in gay friends. This concept of white supremacy also has this concept of safeguarding rights and equality for all.