Prime Timeline
   | Year | 
   Event | 
   | 1953 | 
   
      
         ● [1]
         First contact between the Andorians and the Vulcans, leading to a prolonged period of hostilities. [1]
      
 
      
         ● [2]
         The Denobulans begin using genetic engineering, with generally positive effect. [3]
      
 
       | 
   
Colour key
● - Shows the canon status and reference of the year for this event
References
| # | 
Series | 
Season | 
Source | 
Comment | 
| 1 | 
ENT | 
3 | 
Proving Ground | 
Shran said that the threat of massive retaliation had prevented a Vulcan attack for 200 years | 
| 2 | 
ENT | 
4 | 
Borderland | 
Phlox said they began doing this over two centuries ago. This is 201 years before the episode. | 
| 3 | 
ENT | 
4 | 
Borderland | 
Phlox said they began doing this over two centuries ago. This is 201 years before the episode |