Immigration in the U.S. has caused families who pay taxes( everybody) to pay for others who did not come in legally. Immigrants can come across the border illegally and apply for social security in which they get our U.S. tax money and get money for any immediate family they have. Hence, American citizens are paying for illegal immigrants who do not pay taxes.
It would be "Whether a new state or territory should enter the Union as Free or Slave" that had the most impact on the Civil War, since the North was strongly against the spread of slavery, while the South was in favor of it.
I think it becomes difficult because they all wanted to have more advantages than anyone else, that became too much for the country that they defeated. The Potsdam Conference became difficult because they have problems on the things that they should do with Germany that they want to completely disarm the country.
I maybe wrong but italians and germans was support.
if that do not help then google is your guy :)
<span>industrialized because they were developing factories</span>