On the site
How Money Walks you can see how wealth migrates from high tax locations to lower tax locations. For example the two snapshots below show that Washington State is gaining wealth from high tax states and losing wealth to lower tax states. This phenomenon is readily observable within the state as well, as wealth is migratiing from high tax counties like King to lower tax counties outside of Seattle.
And then, of course there's the well documented example of how California is driving wealth to other lower tax states.
And yet legislatures in these states keep drinking the poison of raising taxes. And Congress can't seem to understand how high US income taxes drive companies to send more business and jobs abroad.