In which election process is filling a seat based on the population of each state? Electing the president, electing members of the house, electing members of the Senate, electing justices to the Supreme Court

Filling a seat based on the population of each state is primarily applicable to electing members of the House of Representatives in the United States. The number of seats a state receives in the House is determined by its population, and every state is guaranteed at least one seat. Electing the President, electing members of the Senate, and electing justices to the Supreme Court do not follow this process.