How has pro wrestling evolved, with North Carolina roots?

Chris Lea and Cliff Bumgardner created a documentary, “When giants walked here”, about pro wrestling and its local ties to North Carolina. How has the history of pro wrestling evolved over the years and where were some of the North Carolina stomping grounds that started everything? People usually have a very specific mindset when they think pro wrestling, but what are they not thinking about that was very relevant in the growth and economics of it? How was Raleigh, NC a huge part in the evolution of pro wrestling? What local spot in the Triangle was a place wrestlers strived to perform at? Where can people watch this documentary?