pacifist reaction to the American Civil War and the Franco-Prussian War.
The modern holiday of Mother's Day was first celebrated in 1908, when Anna Jarvis held a memorial for her mother in America. She then began a campaign to make "Mother's Day" a recognized holiday in the United States.
Although she was successful in 1914, she was already disappointed with its commercialization by the 1920s. Jarvis's holiday was adopted by other countries and it's now celebrated all over the world.
In most countries, Mother's Day is a recent observance derived from the holiday as it has evolved in the United States. When it was adopted by other countries and cultures, it was given different meanings, associated to different events (religious, historical or legendary), and celebrated on a different date or dates. - from Wikipedia