This is how racism breeds, getting a teacher to teach the history (and agenda) of a particular GROUP as seperate from other Americans.
My kids are half white, half Hispanic, so I can relate to you. They have the advantages of an affluent life, but we don't talk about our family as "mixed", we just talk about it as a family. Mom's ethnicity is Hispanic, and she's fluent in Spanish. So what, that's really cool.
I don't want my kids associating or empathizing with any "movement" or "cause" built around their ethnicity. I want them to concentrate on who they are as our kids, their teacher's students, their coach's athletes, their friends' friends, and their community's citizens, and nothing more.