Mr Trump will now feel that his base has endorsed his actions over the past two years, our correspondent says.
The Democrats flipped the Republican-held Colorado Senate, Maine Senate, Minnesota House and both chambers in New Hampshire.
"Tomorrow will be a new day in America", declared House Minority Leader Nancy Pelosi, who would be in line to become the next House speaker.
The 2018 elections also exposed an extraordinary political realignment in an electorate defined by race, gender, and education that could shape USA politics for years to come. Among older whites and whites without a college degree (often a proxy for conservative racial attitudes), the margins were even starker. But in the governor's race, Republican attorney-general Mike DeWine defeated Democrat Richard Cordray.
The four men who lost their seats Tuesday night were vocal supporters of the Tax Cuts and Jobs Act on the campaign trail over the course of the year.
Ilhan Omar and Rashida Tlaib are the first Muslim women and Sharice Davids and Debra Haaland the first Native American women to be elected to Congress.
Three candidates had hoped to become their states' first African-American governors, although just one - Georgia Democrat Stacey Abrams - was still in the running. But the olive branch he extended was studded with thorns as he declared that he would retaliate if Democrats use their control of the House to issue subpoenas to seek his tax returns and investigate his business dealings, his Cabinet's conduct and his campaign's ties to Russian Federation, as expected.
Specifically, with some close races still undecided, Democrats have picked up at least 29 seats in the House.
Trump offered an olive branch to House Democrats as an alternative to an investigative face-off.
Given Trump's suburban unpopularity, some vulnerable incumbents struggled throughout the campaign to keep Trump's reputation at a distance in voters' minds. Democrats flippedseats in suburban districts outside of Washington, Philadelphia, Miami, Chicago and Denver.
Women were assured of at least 107 seats in the House, more than ever before.
Also among them are the first two Native American women elected to the House - Democrats Sharice Davids of Kansas and Deb Haaland of New Mexico - and the first two Muslim-American women, Rhasida Tlaib of MI and Minnesota's Ilhan Oman. After CNN released audio recording of Lewis in which he questioned the parenting ability of same-sex couples, Craig's eldest son, Josh, posted a video on Twitter to defend his mother and support her candidacy.
The loss of the House is a serious blow to Trump who must now brace for the novel experience of oversight from Capitol Hill with Democratic committee chairmen promising constraints on his power that the GOP never attempted.
"The message they were trying to send us is you've got to beat Trump in the battleground states, and you've got to run on very mainstream, nonextreme Democratic ideals and values".
He took credit for Republicans having "defied history" by consolidating their grip on the Senate. Beto O'Rourke's Democratic campaign for Senate in Texas fell short by less than 3 percentage points in Texas, a GOP-heavy state that hasn't elected a Democrat to statewide office since 1994.
Some hurt worse than others.
A majority-Democrat House threatens to stymie Trump's agenda and could lead to the investigation of his administration. "It's clear that if the economy hadn't been that good there would have been a real blow out".
While voters across most demographic groups considered Kavanaugh important as they cast ballots, there were wide differences in concern over the underlying issue.
Another article in The Atlantic said that the 2018 vote finally brought some accountability into the federal government "after two years of executive impunity". But President Donald Trump's Republican Party found strength in critical states that often hold the keys to the presidency.
In the Miami area, former Clinton administration Cabinet member Donna Shalala won an open seat, while GOP Rep. Carlos Curbelo lost his bid for a third term in a nearby district. These voters are concerned that the nation they've known, and that has in many ways been remarkably successful, is slipping away from them.
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