Your comparison of past immigrants with  todays Muslim immigrants is highly flawed. Muslims regard all non Muslims as infidels. Many also believe in the end justifying the means so it is ok to kill and injure in the name of Allah.   The Islamic faith has been spread by violence and forced conversions. Islam is unamerican by it very nature. It is not democratic. Past waves of immigration  did not sanctify terrorism. You need to wake up and stop being so naive.