| Y21:
| Formation of Federation
|
| Y25:
| Formation of Star Fleet
|
| Y40-Y43:
| First Romulan War
|
| Y110:
| Federation converts cruisers to warp power
|
| Y128-Y131:
| Four Year's War between Federation and Klingons
|
| Y141-Y145:
| Enterprise's Five Year Mission (Star Trek Original Series)
|
| Y142:
| Organians form treaty
|
| Y143:
| Klingons and Romulans start trading technology
|
| Y151-Y156:
| 1X Technology available
|
| Y151:
| V'Ger Incident (Star Trek I)
|
| Y156:
| Genesis chain of events (Star Treks II,III,IV), (Star Trek V)
|
| Y156-Y237:
| 2X Technology ("Transwarp") available, unknown time period
|
| Y156-?:
| Enterprise NCC-1701-A in service
|
| Y173-Y226:
| Enterprise NCC-1701-B in service (for a long time!)
|
| Y227-Y234:
| Enterprise NCC-1701-C in service
|
| Y237-Y241:
| 3X Technology ("Ultrawarp") available
|
| Y237+:
| Enterprise NCC-1701-D in service (The Next Generation)
|