Which immigrant groups adapted especially well economically? which groups lagged? why?

Most Asians adapted well because they quickly learned how to compete with Americans in general, especially for jobs. Other races were also good, but often had other problems, like Mexicans often try to cross the border, and people in the Middle East are still dealing with a new terrorist threat: ISIS, which is still wreaking havoc on its civilians from even fleeing to the U.S
Of course, White Caucasians made fun of all the other races, including Asians, and they tried to conquer the world 300 years ago for the same reasons.
Hope this helps!