H/T History.com.
In spite of what that half wit Lyndon Johnson decreed I think the Decoration/Memorial Day tradition originated in Columbus, Georgia in 1866.

Members of the 3rd U.S. Infantry Regiment place American flags at the graves of U.S. soldiers buried in Section 60 at Arlington National Cemetery in preparation for Memorial Day May 24, 2012.
(Credit: Win McNamee/Getty Images)
Memorial Day and its traditions may have ancient roots.
While the first commemorative Memorial Day events weren’t held in the United States until the late 19th century, the practice of honoring those who have fallen in battle dates back thousands of years. The ancient Greeks and Romans held annual days of remembrance for loved ones (including soldiers) each year, festooning their graves with flowers and holding public festivals and feasts in…
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