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This swing district voted for Barack Obama both times and for Donald Trump in 2016. The seat has been mostly held by a Republican for the past two decades.

This often-redrawn district in Orange County, once a pillar of the Reagan-era Republican Party, has experienced an influx of Asian-American and Latino voters. Although some suburban voters may be uneasy with President Trump, the district is not exactly liberal.

Redistricting made this open district, whose territory had been mostly represented by the Republican moderate Charlie Dent, both more left-leaning and more compact.

Technology is crowding curbs with ride hailers and keeping homeowners fixated on housing values. Here are the tools that Emily Badger, a writer for The Upshot, uses to analyze the ripple effects.

This district includes southern Orange County and western San Diego County. Since 2000, the seat has been held by the Republican Darrell Issa, who was re-elected by a very narrow margin in 2016 and who announced his retirement in January. His rough-edged partisanship was growing out of sync with this affluent, increasingly moderate district.