The Republican Party has achieved full control of the US government, after media projected wins for the party in a handful of close races in the House of Representatives.
Republicans won the majority in the Senate earlier this week, while Donald Trump won the race for the presidency.
The trifecta, last achieved at the start of Trump's first term in 2017, will give the President-elect significant authority to enact his agenda on the economy, immigration and other key issues.
It also leaves Democrats with less leverage to challenge policies they disagree with, though narrow margins mean Senate Republicans could still struggle to secure enough votes for some actions.