Gina Raimondo, the governor of tiny Rhode Island, has taken on unions, boosted big business, and made friends with Republicans. She is also one of just 15 Democratic governors in the country. Would there be more of them if there were more like her?

Societies where people trust one another are healthier and wealthier. In the U.S. (and the U.K. and elsewhere), social trust has been falling for decades — in part because our populations are more diverse. What can we do to fix it?