I read something recently that claimed North Dakota was ranked first among the 50 states for having the most agreeable people. Huh. I decided this was research I had to find, since I was curious about how Wisconsin fared. You can read it too, and see how the states are ranked for the extraversion, agreeableness, conscientiousness, neuroticism, and openness of their citizens. Wisconsin, by the way, was ranked 5th for agreeableness and 2nd for extraversion.
This research is explained and reported in the article:
Rentfrow, P. J., Gosling, S. D., & Potter, J. (2008). A theory of the emergence, persistence, and expression of geographic variation in psychological characteristics. Perspectives on Psychological Science, 3(5), 339-369.