Answer:
Critical race theory is an academic concept that is more than 40 years old. The core idea is that race is a social construct, and that racism is not merely the product of individual bias or prejudice, but also something embedded in legal systems and policies.
The basic tenets of critical race theory, or CRT, emerged out of a framework for legal analysis in the late 1970s and early 1980s created by legal scholars Derrick Bell, Kimberlé Crenshaw, and Richard Delgado, among others.
A good example is when, in the 1930s, government officials literally drew lines around areas deemed poor financial risks, often explicitly due to the racial composition of inhabitants. Banks subsequently refused to offer mortgages to Black people in those areas.
Explanation: https://www.edweek.org/leadership/what-is-critical-race-theory-and-why-is-it-under-attack/2021/05