[SunkenCiv]

There was no such major disruption. The use of iron depended both on supply of ore and the supply of some energy to process it, just as the supply of bronze depended on raw materials. These came and went on different timetables for different societies (the use of bronze in America appears to have arrived only about 1000 years ago). The 19th century idea of English-pasture-like neat little steps from stone to copper to bronze to iron is d-e-a-d.

George W. Bush will be reelected by a margin of at least ten per cent

[Destro]

I am talking about the collapse of the Bronze age civilizations.

http://www.findarticles.com/p/articles/mi_m1511/is_n3_v19/ai_20324744

Empires in the dust - collapse of Bronze Age cultures in 2,200 A.D