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Google AI responds when questioned about the "Long Twentieth Century": The phrase "the long twentieth century" refers to a period spanning roughly from the late 19th century to the early 21st century , characterized by profound transformations in global politics, economics, society, and technology. For my purposes, the term can either mean (1) from 1900-2000 with projections to 2100 or (2) from 1950 -2000 with projections to 2100. You can run estimated Dynamic Component statistical models for the periods at: The Long Twentieth Century (1900-2000+) The Late Modern (1950-2000+) A continually add models as I am able to document them in my blogs. Periodization For the Quantitative Historian, selecting a time period over which to display statistical data or estimate models is an interesting problem with no solution. My approach has been estimate multi-models over whatever period seems appropriate to the purple (from a decade to 2000 ye...
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