When I was a Stro I think we were NL team. I know when I was a cub we were. I'll have to check my rook card to be sure...
Astros were "blackmailed" in to moving from the NL to the AL in 2013 to even out the number of teams in each league.
Drayton McLane decided to sell the team and Jim Crane wanted to buy them.
Problem is, Jim Crane had a business discrimination skeleton in his closet.
In order for Crane to be approved to purchase the team, Commissioner Bud demanded that he agree to move to the AL to balance the leagues. After 50 years as an NL team, Commissioner Bud decided it made more sense to force the Astros to move, rather than move his own Brewers BACK to the AL (previously moved for the AL to the NL) or move the Expos to the AL when they became the Nationals or move one of the newest teams (Diamondbacks or Rockies) who were clearly more suited for being a West Division Team.
The Hypocrisy of the situation is, moving the Astros to the AL West did not change the the discrimination issue, which Bud was going to use to deny his ownership.
Jim Crane, knowing he had a business opportunity on his hands, agreed to the change, with a stipulation of his own.
He wanted a discount on the team. I don't remember the exact numbers, but I think the actual purchase price was about $25 Million less THAN HAD ALREADY BEEN AGREED ON. MLB ended up paying about $10 Million and Poor old Drayton McLane was out the rest.
I can't believe DM didn't sue the pants off Bud and MLB. It cost him $15 Million because Bud wouldn't approve the sale unless the Astros moved to the AL West.
The Astros beating the Yankees and then the Cubs or Dodgers to become World Champions would go a long way to alleviating some of the ire that Astros fans feel over the situation.