100 years ago today, Arlington National Cemetery inaugurated the first of what is a long-standing tradition: The dedication at the Tomb of the Unknown Soldier. Initially, this was part of a worldwide trend to honor November 11th as Armistice Day, or the day that fighting for the Great War ended. After what most regarded as the worst conflict in human history, it was hoped that humanity would never again experience such a conflict. That we primarily refer the Great War as World War I should tell you that humanity did not achieve that aim.
The British and the French took the lead in dedication ceremonies for the Tomb of the Unknown Soldier, holding the first of its dedications at Westminster Abby and the Arc De Triomphe respectively in 1920.