Conversation so far:
What did Casey Kasem have to do with the American Top 40?
Kasem, along with Don Bustany, Tom Rounds, and Ron Jacobs, launched the weekly radio program American Top 40 (AT40).
When did they launch the program?
On July 4, 1970.

Question: What else happened during this time period?
Self-contained rewrite: Besides weekly radio program, what else happened during 1970-1988 period?