To change the number of seats in the U.S. House of Representatives, Congress must pass a bill, and the President must sign it. The number of seats also changes when a state is added or subtracted, but it is restored to 435 at the next apportionment. Seats are reapportioned after each official census. The number apportioned to each state equals the state population divided by the total population of all of the states times 435, then rounded either up or down to the next whole number according to a formula.
The number of seats in the Senate increases by two whenever a state is added and decreases by two whenever a state is subtracted. To change the number of Senators per state from two requires the ratification of an amendment to the U.S. Constitution.
ReapportionArticle I of the Constitution directs Congress to reapportion-redistribute-the seats in the House after each decennial census.
The final authority to determine the number of seats for each state in the U.S. House of Representatives lies with the U.S. Congress. This decision is made through the process of apportionment using data from the decennial census.
cogressional apportionment
The Apportionment of seats in the House of Representatives of the 435 seats among the 50 states
Apportionment
The apportionment of seats in the senate was not fair to some parties.
The total number of seats in the House of Representatives was fixed at four hundred thirty-five (435) by the Apportionment Act of 1911. Seats are apportioned (distributed) according to population. Each state receives at least one representative regardless of population. In the Senate, two senators represent each state.
determining the number of seats each state is entitled to in the U.S. House of Representatives
That is why I asked you
reallotment: a new apportionment (especially a new apportionment of congressional seats in the United States on the basis of census
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Apportionment