A lot of non WASP citizens in this country especially those working in the NHS such as Doctors and nurses do a Stirling job propping up these organisations. There are not enough WASP citizens to do these kind of jobs.
Also undesirable jobs such as harvesting crops by hand are carried out by immigrants because WASP citizens will not do these kind of jobs. In fact the immigrants do the job in a more hard working fashion. Without immigrants this country would grind to a halt!
