Near present-day St. Augustine, Spanish explorer Juan Ponce de León comes ashore on the Florida coast, and claims the territory for the Spanish crown.

The legendary Texas Ranger and frontiersman “Big Foot” Wallace is born in Lexington, Virginia.

After a public disturbance occurred between policeman Wyatt Earp and a candidate for Wichita, Kansas county sheriff, Earp is fined $30 and relieved of his job.

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.

Secretary of Defense Melvin Laird announces that the United States is moving to “Vietnamize” the war as rapidly as possible. By this, he meant that the responsibility for the fighting would be gradually transferred to the South Vietnamese as they became more combat capable. However, Laird emphasized that it would not serve the United States’ purpose to discuss troop withdrawals while the North Vietnamese continued to conduct offensive operations in South Vietnam. Despite Laird’s protestations to the contrary, Nixon’s “Vietnamization” program, as he would announce it in June, did include a series of scheduled U.S. troop withdrawals, the first of the war.

The rise of the action-adventure blockbuster was on the horizon, but on April 3, 1978, the small-scale romantic comedy triumphs over the big-budget space extravaganza. At the 50th annual Academy Awards, held at the Dorothy Chandler Pavilion in Los Angeles, Woody Allen’s Annie Hall won the Oscar for Best Picture, beating out George Lucas’ Star Wars.

Ronald H. Brown, the U.S. secretary of commerce, is killed along with 32 other Americans when their U.S. Air Force plane crashes into a mountain near Dubrovnik, Croatia. Brown was leading a delegation of business executives to the former Yugoslavia to explore business opportunities that might help rebuild the war-torn region.