One might think that, given the sorry state of American 'yoot,' as detailed here:
http://jamesjomeara.blogspot.com/2009/11/greatest-country-on-earth-welcome-to.htmlthe answer might lie in bringing in foreign mercenaries, perhaps with the offer of citizenship.
Oops.
Spengler, of course, located the beginning of the end of the West in the decision during WWI to bring colonial troops over to Europe, arm them with Western weapons, and teach them to shoot at Europeans. Teaching the Coloured World to shoot rifles and hate Europeans was not a good idea.
But who listens to some old Kraut?
http://jamesjomeara.blogspot.com/2009/11/spengler-on-spree-one-might-think-that.html