In this perception, we are distantly related to each other, which means we should live in large groups and must learn to work and get along with each other, regardless of race, nationality, age, sex, religion or appearance. Humanists believe in treating people as individuals, not stereotyping and discriminating against entire groups of people. Although we all have been educated this theory by the compulsory science curriculum in school, we always ignore this perception and make decisions based on personal experiment and point of view. This is sometimes irrational and can lead to prejudice and discrimination. For example, in the history of the United States, racial discrimination has been a major problem since the colonial era and the slave era, white Americans have discriminated against Native Americans, African Americans, Asian Americans, Latin Americans, Europeans Americans and Asians; they also had the prejudice that "black blood is not the same as white blood" despite the fact that, deep down, we are all