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https://en.wikipedia.org/wiki/2018_United_States_elections
The net gain of 40 seats represented the Democratic Party's largest gain in the House since the 1974 elections.[26] Democrats won the nationwide popular vote for the House of Representatives by 8.6 percentage points,[27] one of the highest margins won by either party since 1992.[24]
Due in part to the surge in turnout, the total number of votes won by Democratic candidates for the House of Representatives nearly equaled the number of votes Trump won in the 2016 presidential election.[28]
The 2018 elections were the third midterm elections since 2005 in which the President's party lost control of the House of Representatives.
Two weeks after the election, Nate Silver of FiveThirtyEight wrote: "There shouldn't be much question about whether 2018 was a wave election. Of course it was a wave".[152] It was third-largest midterm change of seats for either party in the House in the post-Watergate era,[151] and the largest Democratic House gain since 1974.[158]
In Ohio and North Carolina, Democrats failed to pick up a single seat despite winning close to half the vote. While Democrats won almost half the vote in Ohio, they only won a quarter of its House elections. The New York Times asserted that gerrymandering affected the outcomes of races in those states.[159] Democrats also made among the largest gains in House seats in Pennsylvania, where the state Supreme Court had struck down a heavily gerrymandered map that favored Republicans.[160]