There was an anti-war movement in the US, pro communism in the US was never a thing back then so I’m assuming the other one is true too lol.
So that all the states get more fair representation instead of the states with the most people deciding everything
Article I, Section 2 of the Constitution sets three qualifications for representatives. Each representative must (1) be at least twenty-five years old, (2) have been a citizen of the United States for the past seven years, and (3) be (at the time of the election) an inhabitant of the state they represent.