Mother's Day has roots in early peace movement

From Nation of Change:  

Mother’s Day began in America in 1870 when Julia Ward Howe wrote the Mother’s Day Proclamation. Written in response to the American Civil War and the Franco-Prussian War, her proclamation called on women to use their position as mothers to influence society in fighting for an end to all wars. She called for women to stand up against the unjust violence of war through their roles as wife and mother, to protest the futility of their sons killing other mothers’ sons. Read more here

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