Slim majority for Republicans after Democrats flip final House seat
Getty ImagesRepublicans will hold a narrow majority in the US House of Representatives next year, after Democrats won the final uncalled race in California on Tuesday.
A slender win for Democratic candidate Adam Gray in California's 13th congressional district leaves his party on 215 seats in the lower chamber of Congress, compared with the Republicans' 220.
The trifecta of House, Senate and presidency - last achieved at the start of Donald Trump's first term in 2017 - will give the president-elect significant power to enact his agenda on the economy, immigration and other key issues.
But with a narrow House majority Republicans could still struggle to secure enough votes for some actions.
A majority is achieved in the 435-seat chamber when a party wins 218 seats - which the Republicans surpassed.
The final congressional race to be called in the country was in California's Central Valley - nearly a month after America went to the polls on 5 November. It is not unusual for some contests to take days or weeks to be called.
The race ended in victory for Gray over the Republican incumbent John Duarte, by a margin of fewer than 200 votes, according to the BBC's US partner CBS News.
Gray said it showed the area was "ready for independent and accountable leadership that always puts the Valley's people ahead of partisan politics".
In the presidential contest, Trump beat Kamala Harris in all seven closely watched swing states - handing him a decisive advantage as he mounted a comeback unmatched by any previously defeated president in modern times.
Trump has vowed swift action in his first 100 days in office, including the start of mass deportations of unlawful migrants in the US.
And with the next mid-term elections set for 2026, the president-elect is expected to enjoy at least two years of limited congressional oversight.
The election results also leave Democrats with less leverage to challenge policies they disagree with, though narrow margins mean Republicans in the Senate could still struggle to secure enough votes for some actions.
The House majority could be further eaten away with Trump's selection of a number of Republican lawmakers for key jobs in his incoming administration- notable Elise Stefanik and Michael Waltz.
There is already one vacancy after the resignation of Trump ally Matt Gaetz from the House.
Gaetz left Congress after being lined up to be the next attorney general - only to withdraw after days of debate over whether a committee should release a report on sexual misconduct allegations against him. He denied wrongdoing.
North America correspondent Anthony Zurcher makes sense of US politics in his twice weekly US Election Unspun newsletter. Readers in the UK can sign up here. Those outside the UK can sign up here.