Prehistory through 2150 -- from the beginning of time until the Enterprise pilot.
Enterprise -- From 2151 through 2264, including Enterprise and Discovery, until the premier of The Original Series.
The Original Series -- From 2265 through 2363, the premier of The Original Series until the premier of The Next Generation.
The TNG Era -- From 2363 and the premier of The Next Generation through 2370, season 7 of TNG and season 2 of DSN.
Voyager and later -- From 2371 to the end of time, including the events of DSN season three, Star Trek: Generations, and the events of the entire Voyager series.
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