So in IB History of the Americas class today, we watched a video that informed us about the rise and fall of "Jim Crow" laws, which are now recognized as greatly immoral and racist. In the video, there were many video clips of early 20th century movies such as The Birth of a Nation that depicted African-Americans are ignorant, stupid, and cowardly. However, those types of movies were recognized as racist and immoral in the 1960s, around the Civil Rights Movement.
So my question for you is, at what point in time, socially and politically, do we recognize racism in an aspect of our society that was once widely accepted as moral? Why did it take so long for the American public to realize that those types of movies were racist and immoral?