In 1868, copying a southern annual observance, General John A. Logan of the Grand Army of the Republic, an organization of Union veterans founded in Decatur, Illinois, established Decoration Day as a time for the nation to decorate the graves of the Union war dead with flowers. By the 20th century, various Union and Confederate memorial traditions, celebrated on different days, merged, and Memorial Day eventually extended to honor all Americans who died while in the military service.
when did memorial day become a holiday honoring the american dead from all wars
By the 20th century