This is why people 'forget about gen x' imo, it's because there wasn't a single cultural event that aligned people in the gap between boomers (the baby boom, which resulted in a lot of people being a similar age to form a cohort) and millennials (wide spread access to rapidly developing internet, 9/11, and the dot com bubble happening during formative years)

That's just my opinion though, I know lots of stuff happened in that time, but I think those examples are standout events. (This is my perspective from the US, so things like the Berlin wall, I think had a less significant immediate effect on people here, culturally)