The biggest and most useful stimulous spending is the military. Employing hundreds of thousands of citizens, many from depressed areas. Also, manufacture of tanks, trucks, bulldozers, don't ask don't tell posters, ammo, planes, copters, food provisions, clothing, and a host of other items countless to enumerate.
The added kicker is they are cleansing he planet of filth and scum. I can't wait til they come into your neighborhood.