This chapter details another unique event in the history of reapportionment. Reapportionment in 1911 was the final time the House would increase in size, reaching 435 seats. In 1920, Congress failed to pass a reapportionment bill due to political division between urban and rural interests, and rural interests successfully blocked all attempts to reapportion. For the first time in history, most of the U.S. population was concentrated in urban areas because of demographic shifts. Representatives from rural interests feared a loss of power if reapportionment reflected these shifts, which they viewed as temporary because of World War I and war efforts. This was the only time in history Congress failed to reapportion the House. Towards the end of 1929, Congress passed the Permanent Reapportionment Act, which effectively delegated apportionment to the executive branch and ensured the House remained at 435 seats until a subsequent Congress agreed to change it.