alternate history

US /ˈɔːl.tər.nət ˈhɪs.tər.i/
UK /ˈɔːl.tər.nət ˈhɪs.tər.i/
"alternate history" picture
1.

a genre of fiction in which one or more historical events are changed, and the resulting consequences are explored

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Philip K. Dick's 'The Man in the High Castle' is a classic example of alternate history.
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Many video games explore alternate history scenarios, such as what if World War II had a different outcome.
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counterfactual historyallohistoryuchronia
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alternativealternativelyalternatehistoryalternative energy alternative medicinealternating current