The US Democrats took control of the House of Representatives in the midterm elections and dealt a blow to President Donald Trump.
Democrats can thwart the President's agenda by taking over the lower chamber of Congress for the first time in eight years.
But the Republicans of Mr. Trump will get a grip on the Senate.
The vote on Tuesday was seen as a referendum on a polarizing president, although he can not be re-elected until 2020.
The election confirms a historical trend for the party that is not in the White House to make a profit in the medium term.
The house's Democratic leader, Nancy Pelosi, who holds her position as spokeswoman from 2007 to 2011, said to the acclaimed followers in Washington, "Thanks to you tomorrow will be another day in America."
President Trump focused on the Senate and praised himself by quoting a commentator.
What happens at home races?
The BBC's American partner network CBS, the Democrats, will win the 23 seats they need to take over the lower chamber of Congress. The Americans voted for all 435 seats in the house.
The Democrats could now initiate investigations into Mr Trump's administrative and business affairs, from tax returns to potential conflicts of interest.
They could also block its legislative plans more effectively, in particular its promise to build a wall along the border with Mexico.
Women's candidates developed particularly well in a poll cycle that had been billed as the woman's year.
Two 29-year-old Democrats, Alexandria Ocasio-Cortez and Abby Finkenauer, will be the youngest women ever to win home.
Ilhan OImar and Rashida Tlaib are the first Muslim women, and Sharice Davids and Debra Haaland are the first Native Americans to be elected to the congress. All are Democrats.
What happens at Senate races?
Republicans are on course to expand their slim majority of 51-49 in the upper chamber. This ensures that Mr Trump has a majority to confirm his executive and judicial appointments.
Democrats always faced a tough fight in the Senate this year because they defended 26 races while only nine Republican seats were available.
The most important gains for the Republicans were made in Indiana, Missouri and North Dakota, where they took the Democratic incumbents.
Rick Scott is likely to defeat a Democratic incumbent in Florida, giving the Republicans control of both seats for the first time in more than a century.
Texas Republican Senator Ted Cruz fought back a strong challenge from emerging democratic star Beto O & Rourke.
America's partisan ditches deepen
Analysis by Anthony Zurcher, BBC News
It is a story of two chambers.
The door to a democracy-controlled senate was struck. Donald Trump will continue to have a Republican majority ready and willing to confirm his executive and judicial appointments. The only question now is the size of the advantage of his party.
In the House of Representatives, however, the story looks different. The path of least resistance for Democrats against a majority in this Chamber led through educated suburbs that had long voted for Republicans, but contained voters who were uncomfortable with Donald Trump's politics and rhetoric.
These districts were gradually carried by the Democrats. In Virginia, Illinois and Florida, moderate Republican lost. In places like Colorado, New Jersey, Kansas, Pennsylvania, Texas and New York, Democrats are up for grabs.
It does not feel like the tsunami that many leftists had hoped for, but a steadily rising tide still keeps the Democrats from winning enough to give them control of the house for the first time in eight years give. This will make it possible to stop Trump's legislative agenda and improve his government's control of the congress.
The partisan trenches in America are getting deeper and deeper. And after two years in the dark, the Democrats have the opportunity to fight back.
- What that all means for Trump
More about the middle times:
- Florida restores the voting rights of those convicted
- Why the US midterm elections are important
What happens in the governors' races?
Governors were elected in 36 out of 50 states.
In Florida, the left-progressive Andrew Gillum has given in after an ugly fight against conservative trumpist Ron DeSantis.
However, Democrat Stacey Abrams, the US's first black US governor, refused to give up when her Republican opponent Brian Kemp took the lead after a fierce campaign in Georgia.
Democrat Jared Polis is expected to win the race in Colorado and become the first openly gay man to be a US governor.
Democrats also conquered governorates in Michigan, Illinois and Kansas. In Kansas, Republican Trump ally Kris Kobach was defeated by Democratic Senator Laura Kelly.
The Democratic governor of New York, Andrew Cuomo, who was sometimes called the 2020 presidential candidate, was dismissed for a third term.