Why the discrimination started

Racism, also called racialism, any action, practice, or belief that reflects the racial worldview—the ideology that humans may be divided into separate and exclusive biological entities called “races”; that there is a causal link between inherited physical traits and traits of personality, intellect, morality, and other cultural and behavioral features; and that some races are innately superior to others. Since the late 20th century the notion of biological race has been recognized as a cultural invention, entirely without scientific basis.

South Africa: beach

It initially came about in America during slavery. Lighter skinned slaves tend to work indoors, while dark skinned worked outdoors. In 1865, during the Reconstruction period after the Civil War, the Thirteenth Amendment to the United States Constitution was passed and it abolished slavery.

Explanation:

each played a major role in ending the cold war.

a historian researching the immigration policies of the early 1900s would expect a source written today,rather than in 1910 to :

( a ) be more interested in objective data and statistics.