The Apportionment Act of 1911 (Pub.L. 62–5, 37 Stat. 13) was an apportionment bill passed by the United States Congress on August 8, 1911. 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.[1] It also included, in section 2, a provision to add an additional seat for each of the anticipated new states of Arizona and New Mexico (which happened in 1912), bringing the total number of seats to 435.
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https://en.wikipedia.org/wiki/Apportionment_Act_of_1911