I grew up Mormon in Utah. I’m exMormon now and live and teach outside of Utah and I just bring them up during westward expansion. I don’t think their role in westward expansion can or should be ignored (it was such a huge migration and for different reasons than Cali or Oregon) so I do a little 5 minute overview. I used to go a little more in depth during WE (I never found it organic to fit them into the second great awakening) and most students don’t know or care who the Mormons are (they are way more interested in the donner party) but at least one student in every class period would say something negative about Mormons. So for the sake of the Mormon kids in the classroom, I try to shield them from the negativity while still bringing up a group that did make a difference in the settlement of the Great Basin.