Back in 1997, William Strauss and Neil Howe released The Fourth Turning: An American Prophecy that articulated a roughly 80-year generational cycle of history based on ‘four turnings’ dating back to the Wars of the Roses starting in 1459, climaxing in 1485. That initial crisis was followed by the Armada Crisis from 1569 to 1588, the Glorious Revolution from 1675 to 1689, the American Revolution from 1773 to 1781, the Civil War from 1860 to 1863, and the Great Depression and World War Two from 1929 to 1944.