Regarding this:

Name me a great immigrant accomplishment in the last 50 years?
Many of the the greatest minds of the world have immigrated to the US. This is where the best science has been done, and continues to be done.

First, second, and third generation immigrants are scattered throughout our medical, educational, and scientific communities. The brain drain is flowing in our direction, and we are a stonger nation because of it.

Annecdote that may interest only me: The doctor that tended to me last week in the ER was Chinese, and the dentist I went to today was Pakistani.