Memorial Day is a f ederal holiday observed annually in the United States on the last Monday of May. Formerly known as Decoration Day , it originated after the A merican Civil War to commemorate the fallen Union soldiers of the Civil War. By the 20th century Memorial Day had been extended to honor all Americans who have died in all wars. Memorial Day is a day of remembering the men and women who died while serving in the U nited States Armed Forces. We should never forget... Kelly Ann