system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: how was New York cleaned up after 9/11?

I don't want this to come across as insensitive, but how did it really happen?

 
You don't exactly have teams specialised to clean up something on such a large scale. How were the rest of the buildings demolished? How long did it take? When did that part of New York start operating again such as the opening of shops? Are there any pictures of the clean up? I was very young when this happened, I can remember the day but not the aftermath.
gpt
We actually do have teams specialized to clean up large scale disasters. They are called the National Guard. 

There are also many specialized civilian groups that deal with building demolition and companies that deal with construction clean-up.