1937 Memorial Day Massacre: Chicago Police Department shoot and kill 10 unarmed demonstrators during the “Little Steel Strike” in the United States

1908 1st federal workmen’s compensation law approved

1868 “Decoration Day”, later called Memorial Day is first observed in Northern US states

1848 Mexico ratifies treaty giving U.S.; New Mexico, California and parts of Nevada, Utah, Arizona and Colorado in return for $15 million

1822 House slave betrays Denmark Vesey conspiracy (37 blacks hanged)