The law initially set the number of members of the United States House of Representatives at 433, effective with the 63rd Congress on March 4, 1913.

[citation needed] Be it enacted by the Senate and House of Representatives of the United States of America in Congress assembled, Section 1.

That candidates for Representative or Representatives to be elected at large in any State shall be nominated in the same manner as candidates for governor, unless otherwise provided by the laws of such State.For the first and only time, Congress failed to pass an apportionment act after the 1920 census.

The Reapportionment Act of 1929 established a method for reallocating seats among the states, given population shifts and the maximum of 435 representatives.

[9] A 1941 amendment to the 1929 act made the apportionment process self-executing after each decennial census.