Romney was born to American parents living in the Mormon colonies in Mexico; events during the Mexican Revolution forced his family to flee back to the United States when he was a child. The family lived in several states and ended up in Salt Lake City, Utah, where they struggled during the Great Depression.
Wiki says Detroit but who trusts them.
still off topic: Wiki names the detroit hospital, and that Mitt’s namesake was a Bears quarterback....so much for the ‘mitten state’