Dated April 23, 1880, this claim was filed by Romolo Montoya of Sierra County, New Mexico, for livestock lost during an Apache raid earlier that month.

"Lieutenant Commander Dorothy Ryan checks the medical chart of Marine Corporal Roy Hadaway of Calera, Alabama aboard the hospital ship USS Repose off South Vietnam. Miss Ryan, from Bronx, New York, is one of 29 nurses aboard the hospital ship selected from 500 volunteers of the Navy Nurse Corps."

Considered one of the worst natural disasters in U.S. history, the San Francisco Earthquake struck on the morning of April 18, 1906.

Dated April 20, 1961, Attorney General Robert F. Kennedy released this statement in reference to the controversial and ill-fated Bay of Pigs invasion of Cuba by American-supported Cuban exiles.

The first battles of the American Revolution occurred at the towns of Lexington and Concord, Massachusetts, on April 19, 1775. Shown here is the deposition of Captain John Parker of the Lexington Militia, describing the initial events of the day.

The first engagement of the Civil War took place at Fort Sumter on April 12 and 13, 1861. After 34 hours of fighting, the Union surrendered the fort to the Confederates. Major Robert Anderson informed Secretary of War Simon Cameron of the surrender in this telegram, dated April 18.

"Photograph taken after midnight on April 17, 1912, G St. near 14th. These boys, 10, 11, and 12 years old, were stuck with over fifty papers in their hands, and vowed they would stay until they sold out if it took all night. The oldest said, ‘my mother makes me sell.’"