According to the Brookings analysis, the less-than-500 counties that Clinton won nationwide combined to generate 64 percent of America's economic activity in 2015. The more-than-2,600 counties that Trump won combined to generate 36 percent of the country's economic activity last year.
Clinton, in other words, carried nearly two-thirds of the American economy.
Here's how the researchers, at the Brookings Metropolitan Policy Program, visualized that. You can see immediately what's going on: With the exceptions of the Phoenix and Fort Worth areas, and a big chunk of Long Island, Clinton won every large-sized economic county in the country.