Disdecadence

Disdecadence. This is where monumental disasters occur every twenty years. Ok - well I was thinking count back basically every 20 years and you get a world changing disaster. 9-11, Thatcher then AIDS from 1980, Kennedy ass. 1963, WW11, 1939, Spanish Flu 1918-1920, caused by the great war, Boer War, 1899 then 1880 and on down into history.

Was the North Dakota Indian War 1862 part of the Disdecadence?