Without me, your American civilization would crumble.

Cairo is a city of layers, ancient civilizations crumbled over each other, covered by modern way of life.

I swear to you that our civilization will not crumble under my watch.

Throughout history, empires and civilizations crumbled because their defenses collapsed.

On earth civilization after civilization crumbled, but always a new one sprang up in its dust.

Your civilization would crumble, and the galaxy would fall into our hands.

As civilization crumbled and starvation became the norm, disease would sweep across the land, catching up those on the run.

Though civilization crumbles, let those who are civilized remain so to the end!

Even as civilisation crumbled, those with an eye for the main chance accumulated small, useless fortunes.

Even if their civilization crumbled in a war that could never happen, you, your brothers and sisters, would carry on to the future.