Documents do not need to be provided for the “.us TLD”, however, there are a few criteria that you have to fulfill to register “.us TLD"
The registrant must satisfy one of the following criteria -
1) US citizen
2) Permanent Resident
3) US Organization
4) Foreign organizations doing business in the US.
5) Foreign Organization with a US office.
Also, they must specify the application purpose for registering the ".us TLD" from the following -
1)Business for profit
2)Non-profit
3)Personal
4)Educational
5)Government