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William Strauss and Neil Howe in their books Generations (ISBN 0688119123) and The Fourth Turning divide Anglo-American history into saecula, or seasonal cycles of history, and divide the saecula into generations by birth year, and classify generations and historical periods into four types each.
As history molds generations, so do generations mold history. Modern Anglo-American history runs on a two-stroke rhythm. The two strokes are an Awakening and a Crisis.
A High is an era between a Crisis and an Awakening, and an Unraveling is an era between an Awakening and a Crisis.
The four types of generations are as follows:
The list of generations and their types is as follows:
| GENERATION | TYPE | BIRTH YEARS |
|---|---|---|
| Late Medieval Saeculum: | ||
| Arthurian | Hero | 1433-1460 |
| Humanist | Artist | 1461-1482 |
| Reformation Saeculum: | ||
| Reformation | Prophet | 1483-1511 |
| Reprisal | Nomad | 1512-1540 |
| Elizabethan | Hero | 1541-1565 |
| Parliamentarian | Artist | 1566-1587 |
| New World Saeculum: | ||
| Puritan | Prophet | 1588-1617 |
| Cavalier | Nomad | 1618-1647 |
| Glorious | Hero | 1648-1673 |
| Enlightenment | Artist | 1674-1700 |
| Revolutionary Saeculum: | ||
| Awakening | Prophet | 1701-1723 |
| Liberty | Nomad | 1724-1741 |
| Republican | Hero | 1742-1766 |
| Compromise | Artist | 1767-1791 |
| Civil War Saeculum: | ||
| Transcendental | Prophet | 1792-1821 |
| Gilded | Nomad | 1822-1842 |
| Progressive | Artist | 1843-1859 |
| Great Power Saeculum: | ||
| Missionary | Prophet | 1860-1882 |
| Lost | Nomad | 1883-1900 |
| G.I. | Hero | 1901-1924 |
| Silent | Artist | 1925-1942 |
| Millennial Saeculum: | ||
| Baby boomer | Prophet | 1943-1960 |
| Generation X | Nomad | 1961-1981 |
| Generation Y | Hero | 1982-2003 |
| Generation Z | Artist | 2004-2025? |
According to the above chart, generational types have appeared in Anglo-American history in a fixed order for more than 500 years, with one hiccup in the Civil War Saeculum. (The reasons for this is because according to the chart, the Civil War came about ten years too early; the adult generations allowed the worst aspects of their generational personalities to come through; and the Progressives grew up scarred rather than ennobled.)