It's more about the definition of collapse. By your definition civilization collapsed during World War 2. Generally a large structure that has collapsed is hop

It's more about the definition of collapse. By your definition civilization collapsed during World War 2. Generally a large structure that has collapsed is hopelessly, irreparably broken - capable of performing near 0% of its function. It can't recover, it's not limping along in some form, it is "totaled" and you have to clean up the pieces and start completely over.