Huh? I lived the 70's, don't remember terrorist attacks, just great music, (except disco) :-)
There was a LOT of terrorism in the 70s. There was so much it didn’t even tend to be news, at least not on the national or international front. It was just the background noise of life.
https://en.wikipedia.org/wiki/Category:Terrorist_incidents_in_the_1970s
That was the “golden age” of the PLO, Weather Underground and IRA. It was the era of the OPEC Siege, the LaGuardia Bombing, and Black September. It was a messy time.