Electoral system for national legislature

Organization for Security and Co-operation in Europe (OSCE), United States, General Elections, 5 November 2024: Needs Assessment Mission Report, accessed 12 November 2024

"C. Electoral System

Senators and Representatives are directly elected, primarily through first-past-the-post contests.27 Senators are elected to six-year terms, with approximately one third of senate seats contested for every two years. Elections for all 435 congressional seats are held every two years. Senate electoral districts correspond to the entire state, and Representatives are elected from single-member districts."