The map above shows the largest Non-White group, by county, from 1980 to 2010. Through the map you can see the growth of the hispanic population, as it became the largest non-white group by 2010 in many counties that formerly had black, native american, or asian populations as the largest group. One thing to note, it was not until 2000 that “multiracial” was added as an option on the census.
Minnesota Population Center. National Historical Geographic Information System: Version 2.0. Minneapolis, MN: University of Minnesota 2011.