Why did World War I start and what were its major effects on European society?

Why did World War I start and what were its major effects on European society? Could an argument be made that the War indirectly influenced the rise of multiple authoritarian movements in the postwar period?Sources:Lynn Hunt et al. The Making of the West: Peoples and Cultures. Vol. 2, Since 1500. (Bedford/St. Martin’s), 5th edition OR 6th editionKatherine J. Lualdi, Sources of the Making of the West: Peoples and Cultures, vol. 2, since 1500 (Bedford/St. Martin’s), 4th edition OR 6th editionThese sources can be accessed for free until May 25th 2020 by using the link:https://bookshelf.vitalsource.com/#/books/9781457605512/cfi/0!/4/4@0.00:0.00