CLW, maybe you aren't old enough to remember some key points and the reason I bring California into the conversation. I'll explain.
Southern California was the birthplace of drag racing. It's where a majority of the suppliers and support for race teams were located. Keith Black. Ed Pink. Arias. BRC, Bill Miller Engineering, RCD, BAE, Crower, Hayes, Simpson, Bryant, Velasco, and on and on. They were here because of the weather, and because a majority of the race teams were here.
The previous poster said it wasn't just politics. OCIR, Lyons and Irwindale all closed. Since I lived through the closure of all three, I can tell you it was all about politics that took them out.
Lyons as given the boot because there were "big plans" for the property and the noise and pollution was upsetting. They bulldosed it and the property sat vacant for decades. OCIR gave way to development even though the current Lt. Governor Mike Curb tried to have it designated as a State Park. Ascot Park in Gardena (huge sprint car track with weekly televised events) was bulldosed because, like Lyons, the politicians had big plans for the property. The property sat vacant for decades.
With no reason to stay everyone left California in order to survive (most teams located in California registered their rigs in other states because the California registration fees for rigs is borderline confiscatory). Companies started setting up shop on cheap land in Indy so one or two of the larger teams followed. Once the door was open and the word was out concerning the business friendly environment the rest headed there, too. But it's not without issues. Many crew members and owners of the teams don't want to live there because of the weather. I know of more than one driver or owner that have spouses that absolutely will not move there because they hate the climate. But the climate is considered a minor inconvenience for the teams compared to the business climate they left in California, sunny skies or not.
As side note. California CARB leads they way with regard to regulation which has killed the racing industry here. Chrome shops, machine shops, t-shirt printing companies, auto painters...everyone who handles some sort of chemicals is levied, fined, inspected, reinspected and permitted to death here in the name of saving the planet and global warming and "paying their fair share." It's tough to get a good chrome job done and most of the high end shops have either closed or moved out of state. Why is it I live in the hub of hot rod land and yet we have to send stuff out of state if we want a decent job done.
It's all related to why the teams are in Indy. And in the beginning it had little to do with fuel prices. The mass exodus started when diesel was south of $2 a gallon.
RG