The 1990s was described by Spock as a "strange, violent time" in the history of Earth. (TOS: "Space Seed")
Also during the 1990s, Earth conducts several bacteriological warfare experiments. According to Dr. McCoy, one of their noted experiments produced an infection which resemble those found on the Enterprise crewmembers who visited Omega IV. (TOS: "The Omega Glory")
Years
| 1980s | Timeline 20th century |
2000s |
1990s