Conversation so far:
how did Vince influence the wrestling boom?
promoters shared an understanding that they would not invade each other's territories, as this practice had gone on undeterred for decades; McMahon had a different vision.
What year did they decide not to invade each other's territories?
this practice had gone on undeterred for decades.

Question: what happened in 1980?
Self-contained rewrite: what happened to Vince McMahon in 1980?