Below is a thread I did on Twitter this morning. I used the spool app to compile the individual tweets so I could paste them here.
A conversation is taking place on Twitter, where some teachers are asking other teachers not to use "tribe" to describe their classrooms of students.
Some people are trying to push back on those asking that it not be done. They are pointing to dictionary definitions of the word (tribe) to say that it does not mean only Native people--that it has roots elsewhere.
That's true. The word 'tribe' is not an Indigenous word. It is used to describe many other nations/peoples around the world. But--we are talking about the US. Here, that is precisely what it evokes.
And one need only do some google image searching to see that teachers are definitely using their ideas of Indigenous people to create classroom materials for their "tribe" of kids. (I did the red x overlay to indicate NOPE.)

Here's another one (and again, I added the red x):

And here's another! I could do this all day long. If you are a teacher, please reconsider. This is a new-ish fad, but like many fads, it is harmful. Don't do it!

I took a look at the site "Teachers Pay Teachers" and found many similar problematic ideas there. "Create a tribe" is one. It is like the too-many "what is your Indian name" activities that are everywhere. They draw on stereotypes.
When you do these kinds of activities, teachers, you are introducing and/or affirming stereotypes. Remember! You're a teacher and you have a responsibility to educate children. Stereotypes do not educate! They misinform!
Librarians: when you do these kinds of activities in your libraries, you are also misinforming children.
Writers/illustrators: when you use stereotypes in your books for kids, you contribute to this problem. Case in point: Lane Smith's picture book, THERE IS A TRIBE OF KIDS, and kids in it shown like this: (…ansinchildrensliterature.blogspot.com/2016/07/lane-s…)

Bottom line: there's too many ways this can--will--and DOES go wrong in a society that knows so very little about Indigenous people and our nations. I recommend you step away from using "tribe" to describe your classrooms.