Question: what was the most significant event to happen in the 1990s and why?
Answer: 1990 — Hubble Space Telescope launched during STS-31, a Space Shuttle Discovery mission. 1991 — The Gulf War is waged in the Middle East, by a U.N.-authorized coalition force from thirty-four nations, led by the U.S. and United Kingdom, against Iraq. 1991 — The World Wide Web publicly debuts as an Internet service.