"To the best of my research, you have to go down to Florida and back to 1968 to find a strike threat of effort in the Southeast by educators."
Well, then your research is lacking. Here in Putnam County, TN, a strike by our good, old teacher's union (TEA, of course) delayed the start of school by several weeks back in 2001. I remember this very well because I was a high school student at the time and they're strike delayed the start of school so long that our first day of class was September 11, 2001.
Of course, you only have to listen to the nonsense coming from TEA itself to realize that, like all unions, they are in the business of fostering an adversarial relationship between teachers and local school boards. This, of course, is because in the absense of an adversarial relationship between the employer and the employee, unions can't justify the fees that they take from the employees.
'Collective bargaining' is a just a euphemism for 'price collusion,' which is a federal crime for anyone except a union (and it should be for them, too.) It's anti-competitive and anti-market and very bad for consumers, which is why it's illegal for everyone else. However, the union hacks have paid off enough politicians to get it legalized for them. I don't have a problem with professional organizations raising the interests of a group of professionals, but collective bargaining of wages should be outlawed.