When did racism star and how?

Answer 1

It started thousands of years ago, before civilization. Presumably, different tribes would fight each other, and dislike each other because of it.

Answer 2

Racism has roots in early human civilizations, with evidence of discriminatory practices based on race dating back thousands of years. The concept of race as a social construct developed during the European colonization period, particularly with the emergence of the transatlantic slave trade in the 15th century. Racism evolved and took different forms over time, becoming deeply entrenched in various societies globally.