When the U.S. Constitution was ratified, Congress was granted power to establish post offices and mail routes — many along ...

Many of the details of these wargames are classified, but one key finding is that protecting domestic U.S. bases can’t be ...

It has grown from serving the 13 colonies to reaching nearly 169 million addresses and employing more than 635,000 people.

The one government agency that still reaches nearly every American daily — undeterred by rain, sleet, snow or even gloom of ...

The U.S. Postal Service is turning 250. Saturday’s anniversary comes as the agency faces financial challenges.

Rather than choose to use the force of his command—or implicit threats—Washington chose the path of moral persuasion.

The deadly conflict on the Thai-Cambodian border pits a longtime United States ally with decades of experience against a ...