Answer the following Q with stream of consciousness. Context: 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 set the number of members of the United States House of Representatives at 435, effective with the 63rd Congress on March 4, 1913. This number included a provision for the addition of one seat each for Arizona and New Mexico when they became states.

Question: when did the house of representatives reach 435?
The relevant sentence in the passage is: The law set the number of members of the United States House of Representatives at 435, effective with the 63rd Congress on March 4, 1913. Therefore, the final answer is March 4 , 1913.