the limits between bronze and stone are blurred, but I believe that natural climate changes were major factors in the development of the human race.
it may well be that the indoeuropeans were sent out of asia/russia by natural changes in the land and slowly took over the lands that the megalithics had created.
after all, the beginning of the mesolithic and neolithic were due to a global warming of the climate after the last glaciation. Many other climate events have shaped the history of the world which escape me right now.
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