Immigrant populations in general
Another sweeping generalisation. Emigrations vary -- another top-performing group are Orientals which reflects their traditonal upbringing marked by discipline, patience, determination and perseverence. The Muslim hordes flooding Europe at present are by and large extremely backward, greedy and lazy. Moreover, once the Djihad infrastructure is fully established, you know who they'll go after first and foremonst. Hint: it won't be those contemptuously referred to by some as heteros!