Why must Latinos have everything in Spanish, and why won't they assimilate?

[Loony BoB]

What is it about the American Dream that draws these Spanish-speaking immigrants over here instead of Argentina?

Rubbish that "American Dream" thing. The thing they are more concerned with is whether or not the country will provide them with a better life. At the moment, America ranks higher than Argentina in a lot of things involving human rights and freedoms, amongst other things.

And why should the rest of us have to learn their language?

Here's the great thing: You don't have to, just like they don't have to learn yours.