(WASHINGTON) — The election will determine not only who occupies the White House for the next four years, but also which party controls both the U.S. House and Senate.

All 435 seats in the House of Representatives and 34 seats in the Senate are up for grabs.

Republicans currently control the House while Democrats maintain a slim majority in the Senate.

Find out how the balance of power is changing as election results come in:

Important changes and what to watch for in the Senate race

Jim Justice is expected to win the West Virginia Senate seat, which will flip the state from Democratic to Republican. Incumbent President Joe Manchin decided not to run for reelection, pitting Justice against Democrat Glenn Elliot and Libertarian Party candidate David Moran.

ABC News also projects former President Donald Trump to win in West Virginia. As Dan Hopkins, a political science professor at the University of Pennsylvania, wrote for ABC News’ live election coverage: “In most years, a Senate where every state votes for the same party for the Senate and the president is a Senate where the Democrats fall. short of a majority.

Another Democratic seat was lost in Ohio, where Republican candidate Bernie Moreno is expected to fill the Senate seat previously held – for three terms – by Sherrod Brown, the Democratic incumbent. This presumed victory makes a large Republican majority in the Senate all the more likely.

In Maryland, Democratic Prince George’s County Executive Angela Alsobrooks is expected to win against former Gov. Larry Hogan, a moderate Republican. She is expected to replace Sen. Ben Cardin, also a Democrat, who did not run for re-election, jeopardizing the Democratic seat in the state Senate in a year when the party had nothing to lose s he hoped to retain his narrow majority.

Alsobrooks is currently the first woman elected to a county executive position in Maryland, and she now appears poised to become the state’s first black senator. She would also make history, as Alsobrooks and Lisa Blunt Rochester are expected to be the first two black women to serve in the Senate at the same time.

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