Free City Mail Delivery
On July 1, 1863, the US Post Office inaugurated its free City Mail Delivery Service in part in response to the Civil War.
Before the Civil War, postage only covered the delivery fee between post offices. People had to go to the post office to pick up their letters during its regular business hours. Or in larger cities, they could pay an extra 2¢ to have it delivered to their home or use a private delivery firm.