Historical race concepts

Some scientists spoke of three races of mankind: The Caucasian race living in Europe, North Africa and West Asia, the Mongoloid race living in East Asia, Australia, and the Americas, and the Negroid race living in Africa south of the Sahara. Other scientists had different ideas and spoke of four or five races. These ideas were popular from the late 18th century to the middle of the 20th century. Because these ideas belong to former times, they are called historical definitions of race or historical race concepts.
Today, scientists agree that there is only one human race. Modern genetic research has shown that the idea of three (or four, or five) races was wrong.
19th century.
Johann Friedrich Blumenbach's classification, first proposed in 1779, was widely used in the 19th century, with many variations.
Middle of the 20th century.
The mid-twentieth century racial classification by American anthropologist Carleton S. Coon, divided humanity into five races:
Racism.
There was much prejudice based upon this way of looking.It argued that in the races that make up the human race, there are deep, biologically determined differences. It also states races should live separately and not intermarry.
Someone who partakes in racism is called racist. These are the attitudes that in turn supported the horrors of African slavery, Apartheid, the Jim Crow laws, Nazism, Japanese imperialism, and other crimes committed by mankind against itself.