"FRIENDS AND FELLOW CITIZENS: In this place, hallowed and made glorious by a statue of the best man, truest patriot, and wisest statesman of his time and country; I have been invited – I might say ordered – by the Lincoln Post of the Grand Army of the Republic, to say a few words to you in appropriate celebration of this annual national memorial day…
"We tender you on this memorial day the homage of the loyal nation, and the heartfelt gratitude of emancipated millions..."
Frederick Douglass on Remembering the Civil War, 1878
https://www.americanyawp.com/reader/reconstruction/frederick-douglass-on-remembering-the-civil-war-1877/
(Gee, sure sounds like thanks to me.)