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Natural disasters are one reason, we all know the story of Pompei. But it's hard to destroy a civilization with nature, look back in your lifetime all the hurricanes and earthquakes... So I will answer with a better thing by saying they have been through wars, they have been conquered, and they have evolved and discovered different ways of life. They got new leaders politically and religiously and have changed.

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14y ago

What else can I help you with?