U.S. House seats are determined by ____.

The physical size of a state does not influence the number of House seats it receives. For example, states with large land areas may have small populations and thus fewer representatives, while smaller states with higher populations can have more representatives. Therefore, physical size is not a factor in seat allocation.

The number of registered voters is not the basis for determining House seats. The apportionment relies on the total population, which includes all residents regardless of voter registration status. This distinction ensures that all individuals, including children and non-citizens, are counted in the representation process.

Last election results do not affect the distribution of House seats. The allocation is determined solely by population counts from the census, which occurs every ten years. Election outcomes may reflect the political landscape but do not influence the number of representatives assigned to each state.