The Story of the US Postal Service

At the start of the colonial era, the postal system was

The growth of the nation's early postal system is largely the result of postmaster

To speed mail sorting in the twentieth century, the postal service began to use

In the twentieth century, the postal system experimented with new forms of transport such as

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One can conclude the postal system was eager to try new forms of transport in the 20th century

To speed overland mail delivery to the West Coast, a man designed a horse-relay network called

Mail sent from East to West Coast in the 19th century would probably not have been carried by

Compared with early postal systems in the colonies, the US Postal Service is

As it developed, the US Postal Service strove to provide

The seventeenth century, when the early postal system began, includes the years between

One can conclude from the passage that mail service today relies on air service and