Memorial Day started after the Civil War to honor Union and Confederate soldiers who died. Women in Boalsburg, Pennsylvania and Vicksburg, Mississippi began decorating graves of soldiers in 1864-1865. By 1866, commemorations were held in many towns and Waterloo, New York was recognized as the first to organize a community-wide Memorial Day observance. Memorial Day is now a federal holiday observed on the last Monday in May to honor all Americans who died while serving in the U.S. armed forces.