With the revolutionary war in full swing communication was vital to the success of the United States. Congress needed to find a way to expediently relay information to and from the army.
The delegates to decided to put Ben Franklin in charge of the postal system.
The delivery of the mail at this time was not an easy task. Cities and towns were few and far between and were often separated by dense forests. The mail was rarely delivered successfully and was often times returned.
Franklin's efforts however, did bring the nation together and it worked well enough that the United States decided to keep it, even after the war. It has been running ever since...
"Neither snow nor rain nor heat nor gloom of night...stays these couriers from the swift completion of their appointed rounds."