The Democratic Party will regain control of the US House of Representatives for the first time in eight years, CNN projects, but the Republican Party will hold onto control of the US Senate following Tuesday's midterm elections.

The results set up a divided Congress going into 2020, when President Donald Trump will be seeking re-election. Many viewed the midterms as a referendum on Trump and his policies.

There were also some historic firsts on Tuesday, including the first Muslim women to be elected to Congress (Michigan's Rashida Tlaib and Minnesota's Ilhan Omar), the first Native American women to be elected to Congress (New Mexico's Deb Haaland and Kansas' Sharice Davids), the youngest woman to be elected to Congress (29-year-old Alexandria Ocasio-Cortez in New York), and the first openly gay man to be elected as governor of a state (Colorado's Jared Polis). US Rep. Marsha Blackburn will be Tennessee's first female senator.

House Minority Leader Nancy Pelosi is introduced on stage by Democratic Congressional Campaign Committee Chairman Ben Ray Lujan as they react to the election results.
House Minority Leader Nancy Pelosi is introduced on stage by Democratic Congressional Campaign Committee Chairman Ben Ray Lujan as they react to the election results.
Al Drago/Reuters
Democratic congressional candidate Ilhan Omar is greeted by her mother-in-law at an election-night party in Minneapolis. Omar and Michigan's Rashida Tlaib are <a href="index.php?page=&url=https%3A%2F%2Fwww.cnn.com%2F2018%2F11%2F06%2Fpolitics%2Ffirst-muslim-women-congress%2Findex.html" target="_blank">the first Muslim women to be elected to Congress.</a>
Democratic congressional candidate Ilhan Omar is greeted by her mother-in-law at an election-night party in Minneapolis. Omar and Michigan's Rashida Tlaib are the first Muslim women to be elected to Congress.
Eric Miller/Reuters
A Donald Trump supporter wears a "Make America Great Again" pin at Gov. Scott Walker's election-night party in Pewaukee, Wisconsin.
A Donald Trump supporter wears a "Make America Great Again" pin at Gov. Scott Walker's election-night party in Pewaukee, Wisconsin.
Nick Oxford/Reuters
US Sen. Ted Cruz is embraced by his wife, Heidi, at his election-night party in Houston. The Republican <a href="index.php?page=&url=https%3A%2F%2Fwww.cnn.com%2F2018%2F11%2F06%2Fpolitics%2Ftexas-senate-ted-cruz%2Findex.html" target="_blank">defeated his Democratic challenger,</a> Beto O'Rourke, CNN projects.
US Sen. Ted Cruz is embraced by his wife, Heidi, at his election-night party in Houston. The Republican defeated his Democratic challenger, Beto O'Rourke, CNN projects.
Cathal Mcnaughton/Reuters
Supporters of Georgia gubernatorial candidate Brian Kemp listen to a speaker as they wait for poll numbers to come in at his election-night party in Athens, Georgia.
Supporters of Georgia gubernatorial candidate Brian Kemp listen to a speaker as they wait for poll numbers to come in at his election-night party in Athens, Georgia.
Chris Aluka Berry/Reuters
Georgia gubernatorial nominee Stacey Abrams addresses supporters in Atlanta early on Wednesday, November 7. <a href="index.php?page=&url=https%3A%2F%2Fwww.cnn.com%2F2018%2F11%2F07%2Fpolitics%2Fgeorgia-governors-race-stacey-abrams%2Findex.html">The Democrat hasn't conceded the governor's race</a> to Republican Brian Kemp, arguing that the high-stakes contest was too close to call and there was the possibility of a runoff.
Georgia gubernatorial nominee Stacey Abrams addresses supporters in Atlanta early on Wednesday, November 7. The Democrat hasn't conceded the governor's race to Republican Brian Kemp, arguing that the high-stakes contest was too close to call and there was the possibility of a runoff.
Leah Millis/Reuters
Democratic congressional candidate Alexandria Ocasio-Cortez greets supporters at her election-night party in New York. At 29, she is <a href="index.php?page=&url=https%3A%2F%2Fwww.cnn.com%2F2018%2F11%2F06%2Fpolitics%2Focasio-cortez-youngest-woman-ever%2Findex.html" target="_blank">the youngest woman to be elected to Congress. </a>
Democratic congressional candidate Alexandria Ocasio-Cortez greets supporters at her election-night party in New York. At 29, she is the youngest woman to be elected to Congress.
Andrew Kelly/Reuters
Democratic volunteers and supporters start to arrive to a watch party at the Hyatt Regency Hotel in Washington.
Democratic volunteers and supporters start to arrive to a watch party at the Hyatt Regency Hotel in Washington.
Jacquelyn Martin/AP
Congressional candidate Deb Haaland hugs a supporter in Albuquerque, New Mexico, after winning her race. Haaland and Kansas' Sharice Davids are <a href="index.php?page=&url=https%3A%2F%2Fwww.cnn.com%2F2018%2F11%2F06%2Fpolitics%2Fsharice-davids-and-deb-haaland-native-american-women%2Findex.html" target="_blank">the first Native American women to be elected to Congress.</a>
Congressional candidate Deb Haaland hugs a supporter in Albuquerque, New Mexico, after winning her race. Haaland and Kansas' Sharice Davids are the first Native American women to be elected to Congress.
Brian Snyder/Reuters
Republican Ron DeSantis and his wife, Casey, celebrate after <a href="index.php?page=&url=https%3A%2F%2Fwww.cnn.com%2F2018%2F11%2F06%2Fpolitics%2Fflorida-governor-ron-desantis%2Findex.html" target="_blank">he won Florida's gubernatorial race.</a>
Republican Ron DeSantis and his wife, Casey, celebrate after he won Florida's gubernatorial race.
Carlo Allegri/Reuters
Jake Kriete looks at his phone as he attends an election-night rally in Indianapolis for Mike Braun, a candidate for the US Senate. <a href="index.php?page=&url=https%3A%2F%2Fwww.cnn.com%2F2018%2F11%2F06%2Fpolitics%2Findiana-senate-mike-braun%2Findex.html" target="_blank">CNN projected</a> that Braun, a Republican, will defeat Sen. Joe Donnelly.
Jake Kriete looks at his phone as he attends an election-night rally in Indianapolis for Mike Braun, a candidate for the US Senate. CNN projected that Braun, a Republican, will defeat Sen. Joe Donnelly.
Jim Young/Getty Images
US Rep. Jared Polis celebrates on stage with running mate Dianne Primavera after it had been projected that he would become <a href="index.php?page=&url=https%3A%2F%2Fwww.cnn.com%2F2018%2F11%2F06%2Fpolitics%2Fjared-polis-colorado-gay-governor%2Findex.html" target="_blank">the next governor of Colorado.</a> Polis, a Democrat, is the first openly gay man to be elected governor of a US state.
US Rep. Jared Polis celebrates on stage with running mate Dianne Primavera after it had been projected that he would become the next governor of Colorado. Polis, a Democrat, is the first openly gay man to be elected governor of a US state.
AAron Ontiveroz/Denver Post/Getty Images
US Rep. Marsha Blackburn, a Republican from Tennessee, speaks to her supporters in Franklin, Tennessee, <a href="index.php?page=&url=https%3A%2F%2Fwww.cnn.com%2F2018%2F11%2F06%2Fpolitics%2Ftennessee-senate-marsha-blackburn%2F" target="_blank">after she was projected to win a US Senate seat.</a> She will be the state's first-ever female senator.
US Rep. Marsha Blackburn, a Republican from Tennessee, speaks to her supporters in Franklin, Tennessee, after she was projected to win a US Senate seat. She will be the state's first-ever female senator.
Mark Humphrey/AP
Nina Williams, attending an election-night party for Georgia gubernatorial candidate Stacey Abrams, is overcome with emotion as women sing on stage in Atlanta.
Nina Williams, attending an election-night party for Georgia gubernatorial candidate Stacey Abrams, is overcome with emotion as women sing on stage in Atlanta.
Leah Millis/Reuters
After attending campaign rallies in Indiana, Missouri and Ohio, President Donald Trump waves after arriving back in Washington on Tuesday evening.
After attending campaign rallies in Indiana, Missouri and Ohio, President Donald Trump waves after arriving back in Washington on Tuesday evening.
Carolyn Kaster/AP
A rainbow forms over the US Capitol as evening sets in on Election Day.
A rainbow forms over the US Capitol as evening sets in on Election Day.
Jonathan Ernst/Reuters
Voters cast ballots at a polling station in Minneapolis.
Voters cast ballots at a polling station in Minneapolis.
Kerem Yucel/AFP/Getty Images
An elections official, right, registers a voter at the Neptune Society Columbarium in San Francisco.
An elections official, right, registers a voter at the Neptune Society Columbarium in San Francisco.
Jeff Chiu/AP
Sarah Salem swims at the Echo Deep Pool in Los Angeles as voters cast their ballots nearby.
Sarah Salem swims at the Echo Deep Pool in Los Angeles as voters cast their ballots nearby.
Jae C. Hong/AP
People vote at the Galleria at Sunset, a mall in Henderson, Nevada.
People vote at the Galleria at Sunset, a mall in Henderson, Nevada.
Ethan Miller/Getty Images
Anthony Craft exits a voting booth after casting his ballot at Martin Luther King Jr. Elementary School in New Orleans.
Anthony Craft exits a voting booth after casting his ballot at Martin Luther King Jr. Elementary School in New Orleans.
Gerald Herbert/AP
A voter fills out a ballot in Pasadena, Maryland.
A voter fills out a ballot in Pasadena, Maryland.
Patrick Semansky/AP
Boats are reflected in a window as voters cast ballots in Newport Beach, California.
Boats are reflected in a window as voters cast ballots in Newport Beach, California.
Patrick T. Fallon/Bloomberg/Getty Images
Voters cast their ballots in Columbus, Ohio.
Voters cast their ballots in Columbus, Ohio.
John Minchillo/AP
Lloyd Salters votes at Caplinger Woods RV & Campgrounds in Stockton, Missouri.
Lloyd Salters votes at Caplinger Woods RV & Campgrounds in Stockton, Missouri.
Charlie Riedel/AP
Voters wait in line at a high-school gymnasium in Brunswick, Maine.
Voters wait in line at a high-school gymnasium in Brunswick, Maine.
Robert F. Bukaty/AP
Stuart Wood wears an "I voted" sticker after casting his ballot in Stockton, Missouri.
Stuart Wood wears an "I voted" sticker after casting his ballot in Stockton, Missouri.
Charlie Riedel/AP
People vote at the Sunueva Laundromat in Chicago.
People vote at the Sunueva Laundromat in Chicago.
John Gress/Reuters
Wayne B. Cutts, left, a veteran who lives in a shelter for homeless veterans, walks with another veteran he drove to the the polls in Phoenix.
Wayne B. Cutts, left, a veteran who lives in a shelter for homeless veterans, walks with another veteran he drove to the the polls in Phoenix.
Ilana Panich-Linsman/The New York Times/Redux Pictures
A woman arrives to vote at the Philomont Fire Station in Purcellville, Virginia.
A woman arrives to vote at the Philomont Fire Station in Purcellville, Virginia.
Al Drago/Reuters
Voters wait in line in Lewiston, Maine.
Voters wait in line in Lewiston, Maine.
Robert F. Bukaty/AP
Lynda Klosterman casts her vote at a Theisen's Home & Auto store in Dubuque, Iowa.
Lynda Klosterman casts her vote at a Theisen's Home & Auto store in Dubuque, Iowa.
KC McGinnis/Reuters
A sign directs voters to a new polling location in Parker, Florida. Hurricane Michael destroyed many schools and other buildings typically used as polling stations.
A sign directs voters to a new polling location in Parker, Florida. Hurricane Michael destroyed many schools and other buildings typically used as polling stations.
Terray Sylvester/Reuters
A woman shows a boy how to fill out a ballot as she votes in Leesburg, Virginia.
A woman shows a boy how to fill out a ballot as she votes in Leesburg, Virginia.
Kevin Dietsch/UPI/Newscom
A voter casts her ballot in Glen Allen, Virginia.
A voter casts her ballot in Glen Allen, Virginia.
Michael Reynolds/EPA/REX/Shutterstock
Voters cast ballots at the Century Baptist Church in Bismarck, North Dakota.
Voters cast ballots at the Century Baptist Church in Bismarck, North Dakota.
Hilary Swift/The New York Times/Redux Pictures
Yvette Pryor casts her vote at the Half Acre Brewery in Chicago.
Yvette Pryor casts her vote at the Half Acre Brewery in Chicago.
John Gress/Reuters
Voters wait in line to cast their ballots in Brooklyn, New York.
Voters wait in line to cast their ballots in Brooklyn, New York.
Holly Pickett/The New York Times/Redux Pictures
Voters cast ballots in Georgetown, Kentucky.
Voters cast ballots in Georgetown, Kentucky.
Maddie McGarvey/The New York Times/Redux PIctures
Voters cast their ballots at a car dealership in Chicago.
Voters cast their ballots at a car dealership in Chicago.
John Gress/Reuters
Volunteer Fu Hua Chen puts up a sign near a polling place at the Hsi Lai Temple in Hacienda Heights, California.
Volunteer Fu Hua Chen puts up a sign near a polling place at the Hsi Lai Temple in Hacienda Heights, California.
Jae C. Hong/AP
Voters line up in Doylestown, Pennsylvania.
Voters line up in Doylestown, Pennsylvania.
Matt Rourke/AP
Voters cast ballots in Manchester, New Hampshire.
Voters cast ballots in Manchester, New Hampshire.
Katherine Taylor/EPA/REX/Shutterstock
Kristen Leach votes with her 6-month-old daughter, Nora, in Atlanta.
Kristen Leach votes with her 6-month-old daughter, Nora, in Atlanta.
David Goldman/AP
Election judges take an oath before opening a polling location in Arlington Heights, Illinois.
Election judges take an oath before opening a polling location in Arlington Heights, Illinois.
Kamil Krzaczynski/EPA/REX/Shutterstock
A poll worker hands out stickers in Atlanta.
A poll worker hands out stickers in Atlanta.
David Goldman/AP
A man fills out a ballot in New York City.
A man fills out a ballot in New York City.
Andrew Kelly/Reuters
A sign guides voters to the polls in Minneapolis.
A sign guides voters to the polls in Minneapolis.
Stephen Maturen/Getty Images
Voters line up at Fire Station 43 in Carmel, Indiana.
Voters line up at Fire Station 43 in Carmel, Indiana.
Aaron P. Bernstein/Getty Images
Falcon Wien, 2, huddles under the coat of her mother, Sarah, as she votes in Mount Kisco, New York.
Falcon Wien, 2, huddles under the coat of her mother, Sarah, as she votes in Mount Kisco, New York.
Richard Drew/AP
Volunteer Albert Lopez sets out signs directing voters to a polling place in El Paso, Texas.
Volunteer Albert Lopez sets out signs directing voters to a polling place in El Paso, Texas.
Chip Somodevilla/Getty Images
Voters wait in line at a polling station in Leesburg, Virginia.
Voters wait in line at a polling station in Leesburg, Virginia.
Andrew Harrer/Bloomberg via Getty Images
Voters line up shortly before the polls opened in Owasso, Oklahoma.
Voters line up shortly before the polls opened in Owasso, Oklahoma.
Mike Simons/AP
Early voters wait in line in Cincinnati on Sunday, November 4.
Early voters wait in line in Cincinnati on Sunday, November 4.
John Minchillo/AP
Garry Henning leaves a polling station after voting in Milwaukee on November 4.
Garry Henning leaves a polling station after voting in Milwaukee on November 4.
Nick Oxford/Reuters
People arrive to vote in Columbus, Ohio, on Wednesday, October 31.
People arrive to vote in Columbus, Ohio, on Wednesday, October 31.
John Minchillo/AP
People vote in Potomac, Maryland, on October 25 -- more than a week before Election Day.
People vote in Potomac, Maryland, on October 25 -- more than a week before Election Day.
Brendan Smialowski/AFP/Getty Images
People vote in Miami on October 22.
People vote in Miami on October 22.
Lynne Sladky/AP
Residents wait in line for their ballot in Des Moines, Iowa, on October 8.
Residents wait in line for their ballot in Des Moines, Iowa, on October 8.
Charlie Neibergall/AP