She will also be the nation's first Somali-American elected to Congress: She was born in Somalia and spent much of her childhood in a Kenyan refugee camp during Somalia's civil war.
Ms Pressley is also the first African-American to serve on the Boston City Council.
With ballots still being counted across the country, women have won 75 seats and are assured of victory in nine districts where women are the only major-party candidates.
Tlaib was elected Tuesday to serve Michigan's Thirteenth District seat, which includes the Detroit area.
She added that even women of colour who were unsuccessful will inspire a new crop of candidates, similar to the white women encouraged to run after Hillary Clinton's 2016 presidential election loss.
Ayanna Pressley became the first African American woman elected to the House of Representatives for MA - a state with that has a black population of only eight percent. Most were considered longshots.
Jahana Hayes, congresswoman-elect for Connecticut's 5th district. "This is the beginning because the message that we sent the world tonight is that it's not OK to put donors before your community", she told her supporters at the time. "We ran to make change".
"I didn't run because my election would be historic". And so, by chance, I'm also making history today. She supports government-paid health care for all, a $15 minimum wage, free college tuition and the abolition of the federal department of Immigration and Customs Enforcement. The victories by the two Democrats - Ilhan Omar and Rashida Tlaib - came on an election night when members of multiple minority groups had a chance to score electoral firsts. Haaland said on Twitter. Nevada now has two female senators after Democrat Jacky Rosen defeated incumbent Republican Dean Heller. Twenty-two states have never elected a woman as governor - six states have female governors now - and research has shown voters are more reluctant to choose women as chief executives than as legislators. In all, 237 were candidates for the House, including 185 Democrats and 52 Republicans. Hegar lost her race on Tuesday in Texas. In New Jersey, Democratic Gov. Jim McGreevy, elected in 2001, had been outed as gay while in office.
Rising left-wing rock star Alexandria Ocasio-Cortez made history on Tuesday, November 6, as the youngest woman elected to Congress, in a safe Democratic Party stronghold in New York, US media projected.
American voters have elected many men in their 20s to Congress, but Ocasio-Cortez could become the youngest woman to join the House.
More women ran in congressional primaries this year than ever before, mostly as Democrats. In 1982, 58 per cent of women voted for Democrats and 41 per cent voted for Republicans.
But other women made gains in the Senate.
The elections have been described as a referendum on the Trump presidency, and is expected to be indicative of the 2020 presidential elections.
"This is truly the year of the woman everywhere", Tom Perez, the chair of the Democratic National Committee, said at an election night party in Washington as results trickled in on Tuesday night. It was the first time Crowley faced a serious primary challenge in 14 years and marked an incredible victory for Ocasio-Cortez.
"Tomorrow will be a new day in America", said the House Democratic leader, Nancy Pelosi, who became the chamber's first female speaker in 2006 and is poised to reclaim the gavel.
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