How did racial categories become a mechanism of social division in North America?

In North America, racial categories emerged as a mechanism of social division rooted in the false premise that human groups are biologically distinct, unequal, and fixed in their attributes. This racial worldview was institutionalized to justify systemic inequality, particularly against people of African and Native American ancestry.1

The Ideology of Inequality

To legitimize social hierarchies, intellectuals and political leaders utilized the Great Chain of Being, a hierarchical paradigm that falsely suggested nature or God ordained human inequality. By the 19th century, this ideology evolved into a belief system where:2
* Physical features were viewed as markers of status and "racial essence".1
* Races were ranked on a gradient of superiority and inferiority.1
* Behavioral and intellectual traits were considered innate and unalterable.1

Institutionalization

This ideology was codified into law and social practice to enforce division. Following the abolition of slavery, Black codes and Jim Crow laws were enacted to mandate racial segregation and restrict the rights of Black citizens. Judicial rulings, such as the Dred Scott case and Plessy v. Ferguson, further entrenched these divisions by denying citizenship and upholding "separate but equal" policies, ensuring that racism remained a foundational element of social organization.2