Are you asking what it is?
Wave of invader swept across Western Europe<span> (Vikings, Franks, Goths, and Huns) trade slowed down to a trickle (people became more isolated) towns became empty, and classic learning just stopped.</span>
I think its the availability of good jobs in the North and West.
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answer: to assimilate indians into mainstream American culture
I would say a since they don't have income except social security.