This month, voters will determine which party controls Congress for the next two years. Democrats currently control both the House and Senate. Republicans had a chance to win majorities in one or both, but it now looks like a competitive battle.
Editing by Phoebe Connelly, Sophia Nguyen and Annah Aschbrenner. Art direction and script adaptation by Hannah Good. Design editing by Chloe Meister. Copy editing by Susan Doyle. Liz Goodwin contributed reporting.