Nah, there are plenty of cities with high LDS populations north of SLC. Bountiful, Centerville, Kaysville are like in the 80-90% ranges. It's when you get into Layton with Hill Air Force Base and Ogden where the population seems to dwindle. North of Ogden, you have Brigham City where the population again is very high.
Yeah no doubt about high percentages in northern utah (I'm originally from Ogden fwiw). Was mostly commenting that it would make sense if Young used this war as a means to migrate people to the true valley (Provo/Orem/etc). Those towns are easily 90%+ LDS. I vaguely remember learning about this in Utah history but it was not characterized in the same light.
