what is Kimberle Crenshaw's theory of multiculturalism?

From the text:

Intersectionality is a framework for understanding the ways that multiple aspects of our identities intersect, influence one another, and compound to create unique experiences. The concept is regularly used to describe the ways that societal privilege and oppression is complicated by the different parts of our identity that are marginalized or privileged in society.”

I will need to look further in order to find the answer to the second part of your question.