Historical fiction always serves the didactic purposes of the present.
Parallel periods comment on today in the sneaky revealing light of yesterday:
Mexican-American War = Iraq-American War
or Classical parallels used earlier:
Imperial Rome = British Empire; Persian Empire = France
Periclean Athens = Britain or France; Sparta = Prussia
Periclean Athens = France; Persian Empire = British Empire (French writers, of course).
Writers explain or glorify the present, or amend past indignities, via histfi. Sir Walter Scott single-handedly rehabilitated and glamorized the Scottish, despised by the earlier Georgian English as uncouth demi-barbarians.
Think of racist images recently over-painted by more realistic or positive characters, whether protagonists or secondaries. This can go too far, into anachronism, as when the Noble Savage is revised into a culture missing notable unpleasant aspects it actually had in order to make it fit what today considers ideal or acceptable.
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