Our civilization could well die of indifference within it before succumbing to external attack.

Most often, these improvements died when the civilization died.

Otherwise, civilisation will sink and die under the impact of centuries of cold.

But if civilization must die again, I prefer to be among friends.

Or perhaps there has been time enough for more to form since their civilization died.

It makes you think about how civilizations die.

All previous civilisations have died through the insufficiency of their underlying principles.

Democracy and civilization at the national level have died in America.

A civilization that had grown a thousand years was dying.

But on Earth when an old civilization died a new, young one rose in its place.