Some help please…

Hey Scott,
I get bored and watch clips from Raw during the Attitude Era, but I'm in the dark on a lot of things that I simply can't remember. So hopefully you and the Doomers could help me out:
1. Why did Vince McMahon join The Union? All I know is that on the May 10, 1999 episode of Raw, he comes out with that group, sans tie (which was a nice touch), and he's talking about looking for the union label. Then Commissioner Shawn Michaels makes a bunch of matches, but I've been unable to figure out how they even got to that point.
2. The night after Backlash 2000, The Rock basically thanks Stone Cold for coming out and wiping everyone out with chairs and helping him win the title back, mentioning that he knew he'd keep his word. Did Austin make an appearance prior to Backlash? How did he wind up getting involved in this brouhaha?

 
Dude, I can barely even remember who the tag champions are these days, someone else is gonna have to field these ones.