Postal Service
The postal service operates as a government monopoly in many countries, including the United States.
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"United States Postal Service Truck."
https://commons.wikimedia.org/wiki/File:United_States_Postal_Service_Truck.jpg
Wikimedia
Public domain.
