At least the immigrants that actually built America learned to assimilate.People have been bitching about immigrants since the country was established, failing to see through their hatred and understanding that immigrants built America.
Who said current immigrants aren't? You have a bad case of myopia. In the past it wasn't until the third generation that people became totally assimilated and it's no different now. You can't expect freshly arrived people to speak perfect English or totally give up the language of their birth.
I went to school with a guy who was born in America with Italian parents. When he started school he could not speak English. First thing the nuns did was give them a pencil and piece of paper and told them to write their names. He copied off of the guy next to him. Yes, he began school getting caught cheating. LOL
So, what's your point? He wasn't third generation, was he?