OK. The NWA Title was basically the champion of all the independent wrestling companies that affiliated as the National Wrestling Alliance. Jim Crockett Jr, head of Jim Crockett Promotions, was essentialy the head of the NWA. It was JC Promotions that owned the air time on Saturday Nights on TBS, known in the 70s and 80's as World Championship Wrestling. This was the home of the biggest stars from the NWA territories because of the constant national TV exposure, which of course lead to bigger house shows and the annual supershows like Starrcade and Great American Bash.
Ric Flair routinely traveled to each independent, defending against that company's top star, in addition to his regular touring with Crockett run shows (he also wrestled extensively overseas but that was often on his own time, not affiliated with the NWA). By 1986 however, Crockett, not wanting to share his top star with the independents, started restricting Flair's appearances on non Crockett Promotions events. He still wrestled about as often, but now he was main eventing as NWA Champ almost exclusively for Crockett.
Both Crockett & Vince were buying up talent from the independents like crazy during this time and as we all know by the early 90s the independents were pretty much gone.
Turner bought the the Crockett Promotions end of the NWA in late 1988. Little changed on TV over the next two years as the wrestlers etc were referred to as NWA stars and the titles wore the NWA brand. There was still a Board Of Directors of old NWA promoters but they held little clout with the Crockett-less company.
Turner and his TV execs wanted to re-brand the wrestling program, feeling that National Wrestling Alliance seemed too small as opposed to World Wrestling Federation. Since the Sat night TBS prime time show was already called World Championship Wrestling they simply used that name, effectively re-branding the titles simply by calling them WCW titles. This took effect in early 1991, Ric Flair is usually credited as being called the first WCW Champion after he beat Sting in Jan although effectively it was the same title from the same promotion. With the independents dying the NWA Board was almlost powerless at this point. The company most associated with the NWA brand, run by Crockett Promotions and showcased on TBS, was the same company, only now they were called WCW and owned by Turner Broadcasting.
There was some rumbling by the old Board when Flair left for the WWF in the summer of 91, basically stating that WCW never should have fired him and since he never lost the World Title he was still their champion. Few fans even noticed this however as WCW crowned Lex Luger. Although there were considerable problems with fans due to Flair's absence no one failed to recognize Luger as champion. At this point the NWA board is completely out of the World Title picture altogether.
In 1993 the Board reconstituted and attempted to re promote as the NWA. Ironically, Turner owned WCW gave them a showcase on their programming and allowed WCW contracted wrestlers to compete for new re-constituted NWA titles. The whole thing was terribly confusing to fans, and by the end of 93 WCW officially dropped any affiliation with the new NWA. However, they had heavily invested in promoting the NWA Title as a top singles title. Rather than just have the title fail to exist WCW basically co-opted the new title, re named The International Title, and promoted it ahead of the US Title as the No. 2 title in the company. The NWA Board, not impressed, did not recognize this as their title (WCW didnt care if they did) and already cut off TBS, etc, attempted to re-organize again with new champions.
WCW quickly realized that fans were still confused, wasnt an International Champion the same as a World Champion ? Booking wise WCW was looking at a way to unify the titles and was tilting towards an Sting-Flair feud that would end with Sting unifying the belts and being WCW Champion. They were also trying Rick Rude, who was International Champion for awhile, as a fan favorite in a feud vs Vader and considering how much impact he should have on the World Title scene. Of course when Flair convinced Hogan to sign and Rude suffered a career ending injury those plans were changed.
Sting ended up with the International Title, beating Vader in Rude's absence and subsequently lost the heavily promoted Unification Match against his friend and partner Flair, the reigning WCW Champ, which set up Flair's heel turn so he would be the bad guy when Hogan arrived. The two titles were merged in June 94 when Flair pinned Sting at Clash Of Champions, and there was never any mention of the Inernational Title ever again.