From 1789 to 1909, the house of representatives grew in size because membership was based on the idea of equal representation. the framers of the constitution planned it that way. more western states had been admitted to the union. the population of the united states grew during those years.

The population of the US increased during these years is the correct answer.

As the representation in House of Representatives is based on population, the Congress increased the number of representatives accordingly with increase in population. In first House of Representatives of 1789, there were only 65 members which increased to 435 in 1913. The number is constant now due to the Permenant Apportionment Act of 1929 which fixed the number of seats at 435.

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