When did the current 4T begin?

[Hintergrund]

(11-20-2019, 09:09 PM)Teejay Wrote:

(11-20-2019, 08:06 PM)Ghost Wrote: In the US, it's probably like this:

1T/2T cusp: 1960-1965 (invention of the birth control pill to the start of US involvement in Vietnam)
2T starting point: November 22, 1963 (JFK's assassination)
2T absolute: 1965-1978 (the start of US involvement in Vietnam to the banning of lead paint)
2T/3T cusp: 1978-1984 (the banning of lead paint to Reagan's 1984 landslide win)
3T starting point: November 4, 1980 (Reagan winning the Reagan vs. Carter election)
3T absolute: 1984-1999 (Reagan's 1984 landslide win to the Columbine shootings)
3T/4T cusp: 1999-2005 (the Columbine shootings to Hurricane Katrina)
4T starting point: September 11, 2001 (9/11)
4T absolute: 2005-present (since Hurricane Katrina)

Those who argue for 2005 as the start of the Crisis for North America, cite the considerable decline in popularity in the Bush Administration in 2005 and 2006.

Many governments lost popularity quickly at some point, but not all of these times opened a new Turning. Was this so unprecedented?