Future And Past

HG Wells, Olaf Stapledon and Poul Anderson each wrote a fictitious history of the future and each also wrote about past history although in different ways.

Wells
The Time Machine (1895) summarizes the future of life on Earth as perceived by a time traveler from the nineteenth century.

The Shape Of Things To Come (1933) is, fictitiously, a dreamed future historical text book.

The Outline Of History (1920) is a world history.

Stapledon
Last And First Men (1930) is a future historical text book transmitted by a mentally time traveling Last Man into the brain of its twentieth century author who distorts most of what he receives and thinks that he is writing fiction.

Last Men In London (1932) is an assessment of past history from the perspective of Stapledon's future history.

Anderson
The History of Technic Civilization (1951-1985) is a future history series in the tradition not of Wells or Stapledon but Heinlein.

The Time Patrol series (1955-1995) describes physical time travel to historical and prehistorical periods in the context of a fictitious future history different from the one in the Technic History or in any other future historical works by Anderson.

Thus, The Outline Of History, Last Men In London and the Time Patrol series are different kinds of works about the past.

Another Comparison
Wells describes a Martian invasion of Earth in an independent novel (1897).
Stapledon incorporates Martian invasions of Earth into his future history.
Anderson describes the economic conquest of Earth by militarily superior extrasolar humanoid aliens in an independent short story (1955).