To further extend from the suffrage movement, it is important to note that minorities (men & women) didn't legally have the right to vote until the 1965 Voting Rights Act.

So Sanchez has a point in claiming that historical precedence has shown that "discrimination" was thought to have ended after the suffrage movement when it wasn't until many years later that minorities were legally secured the right to vote. Hence the hierarchy is that white women are the "next-in-line" when it comes to diversity before any other type of minority group.