And we don’t have the vast range of accents and dialects as England! From Cockney (as spoken on Eastenders) to Liverpudlian (as spoken by the Beatles) to Received Pronunciation (aka BBC English). Even those of us who have never been to the UK are at least somewhat aware of those differences.
As someone who was born in California, raised mostly here, and has spent the vast majority of my life here, I don’t think we have an accent. But experts say there is a California Accent. No, I don’t mean that exaggerated, artificial ‘Valley Girl’ travesty that is akin to slang and so many associate with the state. Like the rest of the Pacific Coast, our accent is part of the continuum from the US Northeast, Great Lakes, and Midwest, a remnant of our migration pattern. But there are traces of the Southern Drawl in some parts of the state too. We also have an admixture from Latin American Spanish and various Asian/Pacific Islander languages, but more in the form of the words we choose to use.