We usually think about the type of houses being built in different states, such as Santa Fe, as having a mix of Spanish, Colonial, and Indian Pueblo architecture. Or farmhouses, ranches, and craftsmen in Texas. I never thought about the type of houses being built in Democratic or Republican areas. Apparently, multi-family is popular in blue states and single-family is popular in red states.
Did you ever think of it that way? Interesting article by NAHB below.