Issued on May 18, 1896, the ruling in this Supreme Court case upheld a Louisiana state law that allowed for "equal but separate accommodations for the white and colored races." It was not until the Supreme Court's decision in Brown v. Board of Education of Topeka, Kansas and congressional civil rights acts of the 1950s and 1960s that systematic segregation under state law was ended.

In this milestone decision, the Supreme Court ruled that separating children in public schools on the basis of race was unconstitutional. It signaled the end of legalized racial segregation in the schools of the United States, overruling the “separate but equal” principle set forth in the 1896 Plessy v. Ferguson case.

The first Senate vote in the impeachment of President Andrew Johnson was taken on May 16, 1868. Article XI was called the "omnibus article" because it combined all of the charges against the President. As a result of 19 voting "Not Guilty" and 35 voting "Guilty," the Senate fell 1 vote short of the two-thirds majority required for removal. After a 10-day recess, the Senate reconvened and voted on Articles II and III. In each case, the result was identical: Johnson was not guilty by a single vote. The Senate then voted to end the trial.

Reguarly scheduled airmail service first began in the United States on May 15, 1918. Pictured here is Wm. C. Hopson, a Mail Service pilot in 1926.

This photograph was part of The Way We Worked exhibition, on display at the National Archives in 2006.

At midnight on May 14, 1948, the Provisional Government of Israel proclaimed a new State of Israel. On that same date, the United States, in the person of President Truman, recognized the provisional Jewish government as de facto authority of the Jewish state (de jure recognition was extended on January 31, 1949).

Jack Roosevelt Robinson (1919-72) was the first African American to "officially" play in Major League Baseball. When he retired from the game, Jackie Robinson went on to champion the cause of civil rights from his position as a prominent executive of the Chock Full o’Nuts Corporation.

Robinson had grown increasingly impatient with what he regarded as President Eisenhower's failure to act decisively in combating racism. In this letter dated May 13, 1958, he expresses his frustration and calls upon the President to finally guarantee Federal support of black civil rights.

Denied a career in the Foreign Service due to an amputated leg, Virginia Hall would go on to work undercover in France during World War II for British intelligence and later the U.S. Office of Strategic Services (OSS), organizing numerous sabotage operations against German forces. In this memo dated May 12, OSS Director William Donavan informs President Truman that she has been awarded the Distinguished Service Cross — the only female civilian in the war to receive this honor. After the war she became one of the new CIA’s first female officers.