Lacking sufficient funds to build a strong navy, the Continental Congress gives privateers permission to attack any and all British ships on April 3, 1776.

On April 3, 1860, the first Pony Express mail, traveling by horse and rider relay teams, simultaneously leaves St. Joseph, Missouri, and Sacramento, California. Ten days later, on April 13, the westbound rider and mail packet completed the approximately 1,800-mile journey and arrived in Sacramento, beating the eastbound packet’s arrival in St. Joseph by two days and setting a new standard for speedy mail delivery. Although ultimately short-lived and unprofitable, the Pony Express captivated America’s imagination and helped win federal aid for a more economical overland postal system. It also contributed to the economy of the towns on its route and served the mail-service needs of the American West in the days before the telegraph or an efficient transcontinental railroad.

One of America’s most famous criminals, Jesse James, is shot to death by fellow gang member Bob Ford, who betrayed James for reward money. For 16 years, Jesse and his brother, Frank, committed robberies and murders throughout the Midwest. Detective magazines and pulp novels glamorized the James gang, turning them into mythical Robin Hoods who were driven to crime by unethical landowners and bankers. In reality, Jesse James was a ruthless killer who stole only for himself.

On April 3, 1948, President Harry S. Truman signs the Economic Assistance Act, which authorized the creation of a program that would help the nations of Europe recover and rebuild after the devastation wrought by World War II. Commonly known as the Marshall Plan, it aimed to stabilize Europe economically and politically so that European nations would not be tempted by the appeal of communist parties.

At his small wilderness cabin near Lincoln, Montana, Theodore John Kaczynski is arrested by FBI agents and accused of being the Unabomber, the elusive terrorist blamed for 16 mail bombs that killed three people and injured 23 during an 18-year period.