Because the constitution requires state and national government to be united, but each having it's own power. The constitution also states that no one person should have too much power, nor should any branch or state have too much power, so the power is split evenly.
Protect the right to freedom
"<span>because the trend of Chinese immigrants to large urban cities harmed the industrialization of the US economy" is the best option but there were wavering levels of truth to this. </span>
