There are people who keep statistics on how much money taxpayers in the various states pay out to the federal government, and how much money states get back. California and New York once were always at the bottom of the list for percentage of their federal taxes that they get back in benefits. This report (click) shows that while California and New York were once "donor states," they're now about at an even balance.
The ability to deduct state and local taxes served to level that imbalance, but the Trump tax bill upsets the balance once again.
-Joe-