David Kaiser in Time:
During the 1990s, two amateur historians, Neil Howe and the late William Strauss, developed a new theory of American history in two books, Generations: the History of America’s Future (1991), and The Fourth Turning: An American Prophecy (1997). They identified an 80-year cycle in American history, punctuated by great crises that destroyed an old order and created a new one.
The great crises identified by Strauss and Howe included the era of the American Revolution and the Constitution (1774-1794); the Civil War and its immediate aftermath (1860-68); and the Depression and the Second World War (1929-45). Doing the math, they predicted another great crisis sometime in the first 15 years of the 21st century.
On discussing the Howe and Strauss theory with Stephen Bannon:
More than once during our interview, [Bannon] pointed out that each of the three preceding crises had involved a great war, and those conflicts had increased in scope from the American Revolution through the Civil War to the Second World War. He expected a new and even bigger war as part of the current crisis, and he did not seem at all fazed by the prospect.