Racism was common in America in the 1950s and 1960s

Racism has existed since the colonial era, when white Americans were given legally or socially sanctioned privileges and rights while these same rights were denied to other races and minorities.

Explanation:

Major racially and ethnically structured institutions and manifestations of racism have included genocide, slavery, segregation, Native American reservations, Native American boarding schools, immigration and naturalization laws, and internment camps.

d is the best answer for this question.