I found an article from 1922 talking about combining Memorial Days- "Although it has long been their custom of many Southern states to observe a memorial holiday of their own on April 26, the tendency to a uniform observerance has been apparent since the world war. The Legion, composed of both the North and the South, officially adopted May 30 as its Memorial Day and posts of the world war men on both sides of the Mason-Dixon line have, for the last three years, simultaneoulsy honored the dead of the Civil, Spanish-American and World wars." Indianapolis, Ind., May 15, 1922

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David Upton