The colonists were divided over breaking away from British rule and split into two factions: Patriots who rejected British rule, and Loyalists who desired to remain subject to the King. General Thomas Gage was commander of British forces in America at the beginning of the war. Upon hearing the shocking news of the onset of war, Washington was "sobered and dismayed", and he hastily departed Mount Vernon on May 4, 1775, to join the Continental Congress in Philadelphia.
On May 5, 1868, General John A. Logan issued a proclamation calling for "Decoration Day" to be observed annually and nationwide; he was commander-in-chief of the Grand Army of the Republic (GAR), an organization of and for Union Civil War veterans founded in Decatur, Illinois. With his proclamation, Logan adopted the Memorial Day practice that had begun in the Southern states three years earlier.
American inventor Thomas Edison started research soon after Röntgen's discovery and investigated materials' ability to fluoresce when exposed to X-rays, finding that calcium tungstate was the most effective substance. In May 1896 he developed the first mass-produced live imaging device, his "Vitascope", later called the fluoroscope, which became the standard for medical X-ray examinations.
The National Conference on Lynching took place in Carnegie Hall, New York City, May 5–6, 1919. The goal of the conference was to pressure Congress to pass the Dyer Anti-Lynching Bill. It was a project of the new NAACP, which in April released a report, Thirty Years of Lynching in the United States, 1889-1918.
Kennedy gave a speech at Saint Anselm College on May 5, 1960, regarding America's conduct in the emerging Cold War. The address detailed how the American foreign policy should be conducted towards African nations, noting a hint of support for modern African nationalism by saying, "For we, too, founded a new nation on revolt from colonial rule".