History of Future History

I just decided to google future history and came up with the wikipedia page for "Future history." The definition is as follows:
The postulated history of the future and is used by authors in the subgenre of speculative fiction to construct as a common background for fiction. Sometimes the author publishes a timeline of events in the history, while other times the reader can reconstruct the order of the stories from information provided therein.

Also to note, it is the title of a series by Robert A. Heinlein and was first coined in 1941. Good to know!