Why does America look down on Mexicans and Canadians?

Americans discriminate against Mexicans because there are a large number of Mexican immigrants in the United States. Most of these Mexican immigrants are poorly educated and can only live in the middle and lower classes of American society, and even many of them are involved in the underworld, which has brought some social security problems to the United States.

Americans laugh at Canadians because they think they are rustic and conservative. In fact, Canadians also laugh at Americans and think that Americans are stupid and arrogant.

In fact, discrimination is a common phenomenon for many people, not just Americans.