After the Armistice that ended World War I, the French government formed "La Ligue des Enfants de France et d’Amérique" (The Children's League of France and America), a charity which used a poppy as its emblem. Madame Guérin created the American branch of this charity, called the "American and French Children’s League". Many organizations adopted the poppy as their memorial flower after World War I ended, and in 1919, Madame Guérin established Poppy Days, under the auspices of her charity.