Let’s look at GDP, or the value of goods and services produced, to understand how the two parties are divided. These days, Democratic House districts are doing substantially better: Two-thirds of the nation’s GDP comes from those areas, with Republican districts making up the rest.

This is striking, because the Republican share of GDP is shrinking. Even though the party controls more House districts than a decade ago, those districts account for less economic activity, Brookings Institution data show.