The answer is:
The major industrial cities became overcrowded as workers from rural areas moved there.
and
Because of the steady increase in food production, the population nearly doubled between 1800 and 1850.
US is more rude to Native Americans. While US is more kind to in foreign affairs because they want to get stuff out of the trade.
It should be the roman law or the federalist paper 10 but thomas jefferson said it and he got it from an italian friend so im pretty sure that it is a