The election process you are referring to is the process for filling seats in the United States House of Representatives. Seats in the House of Representatives are allocated among the states based on their population, as determined by the decennial census. Each state is entitled to a certain number of seats in the House, with larger states having more seats and smaller states having fewer seats. The election process for these seats varies from state to state, but generally involves a direct election by the residents of each congressional district within the state.
