Overall, for America, Immigration has been a very positive thing (except for the Indians).
Except for the Indians? So what went wrong do you think?
Are you saying that the Jewish immigration into Europe was a success?
My examples of immigration success are all American. I have maintained from the beginning that Europeans suck at immigration. They isolate their immigrants, they don't absorb them.
So absorbing immigrants is the key? I would agree. The invading Europeans had not interest in assimilating into Indian culture because they viewed them as primitive and inferior, rather, they were just in the way of their Manifest Destiny.
However, American can't even desegregate many black communities in our inner cities, and the same can be said for Hispanic neighborhoods.
Then you have Islam, and whole different animal altogether who shun American culture, create their own schools, and essentially live by Sharia law.
The whole notion of diversity is our strength, is a lie if one of the two groups hates or despises the other.
American cities are often run on the European models, perhaps because many Democrats who run those cities claim to admire the European system over our own. They create immigrant enclaves with public housing and easy to obtain benefits that stifle any incentive to desegregate. They discourage gentrification of urban neighborhoods and don't provide the security and infrastructure that would attract new business to the area.
One thing I can say about working for as a cop versus working in the IT industry, cops are a very multicultural group. I work side-by-side with Muslim cops, Hindu cops, even a few Xtians. At work, we're all blue. I work with a cop who will go into an empty cell to say his prayers every shift, nicest guy you'd ever want to meet but I breath a little easier when he's next to me during an arrest (he's a badass).
I've lived and worked in Muslim countries and while they have more than their share of arseholes, they are mostly great folk who are the nicest, most hospitable people you could ever want to meet. You could judge a group solely on the actions of a minority of arseholes, but it really isn't right, is it?