Ernest R. Ackerman is born in New Jersey. The six-term Congressman was a collector of philatelic proofs and essays. Many of his items are now in the museum's collections.

Postmaster General Burleson directs local postmasters to keep a “close watch on unsealed matter, newspapers, etc., containing matter which is calculated to interfere with - or otherwise to embarrass or hamper the Government in conducting the war.”

The Siloam Springs and Shreveport Railway post office train #2 is robbed at 4:00 am.

The Post Office Department introduces V-mail (letters microfilmed for easier transport). V-mail could reduce mail cargo space from thirty-seven mail bags to one.

The first night game is played at Ebbets Field in Brooklyn, New York. Stamps honoring Ebbets and nine other baseball fields are issued in 2001.

A provision in President Woodrow Wilson's new Espionage Act empowers the Postmaster General to declare nonmailable any matter that constitutes willful obstruction to the progress of the war.

Mail clerk Charles Spurgeon is killed in a Railway Post Office train wreck near Port Costa, California. Train #18 of the San Francisco & Los Angeles RPO collided with a gravel train.

William Dennison, Postmaster General (1865-1866), dies.

James K. Polk, 11th President of the U.S., dies in Nashville, Tennessee. He was commemorated on a stamp in 1938.