Note on the results: The figure for registered voters is the Voting Eligible Population, taken from the United States Election Project, found here. 

At stake in this election:

• 35 seats in the Senate

Description of government structure:

• Chief of State: President Donald TRUMP*
• Head of Government: President Donald TRUMP
• Assembly: United States has a bicameral Congress consisting of the Senate with 100 seats and the House of Representatives with 435 seats.

* The President is elected by absolute majority in the Electoral College to serve a 4-year term. Each state receives a number of Electoral College votes equal to its two Senators plus the number of seats it has in the House of Representatives, which is based on its population. Washington D.C. receives three electoral votes. A candidate must receive a majority of electoral votes (at least 270) to be elected president.

Description of electoral system:

• The President is elected by an electoral college to serve a 4-year term.
• In the Senate 100 members are elected by plurality vote in multi-member constituencies to serve 6-year terms*. In the House of Representatives 435 members are elected by plurality vote in single-member constituencies to serve 2-year terms.

* One-third of Senate seats are up for election every two years.

Main parties in the electoral race:

• Party: Democratic Party
  • Leader: Chuck SCHUMER
  • Seats won in last Senate election: 47*
• Party: Republican Party
  • Leader: Mitch MCCONNELL
  • Seats won in last Senate election: 51

* The two independents elected caucus with the Democrats.

Population and number of registered voters:

• Population: 325,719,178 (2017 est.)
• Registered Voters: 214,109,367 (2016)

Gender Data:

• Female Population: 165,311,059 (2017 est.)
• Is United States a signatory to CEDAW: Yes (17 July 1980)
• Has United States ratified CEDAW: No
• Gender Quota: No
• Female candidates in this election: Yes
• Number of Female Parliamentarians: 23 (Senate); 84 (House)
• Human Development Index Position: 13 (2018)
• Social Institutions and Gender Index (SIGI) Categorization: N/A

Disability Data:

• Is United States a signatory to CRPD: Yes (30 July 2009)
• Has United States ratified CRPD: No
• Population with a disability: 48,205,330 (2018 est.)