Cal. Gov. Code § 57325

On and after the effective date of an annexation, the territory annexed to a city or district, all inhabitants of that territory, and all persons entitled to vote by reason of residing or owning land within that territory shall be subject to the jurisdiction of the city or district and, except as otherwise provided in this chapter, shall have the same rights and duties as if the territory had been a part of the city or district upon its original incorporation or formation.