▁ 1 8 1 9 , ▁Spain ▁decided ▁to ▁limit ▁its ▁" re ach " ▁in ▁the ▁New ▁World ▁to ▁Northern ▁California ▁due ▁to ▁the ▁costs ▁involved ▁in ▁sust aining ▁these ▁remote ▁out posts ; ▁the ▁northern most ▁settlement ▁therefore ▁is ▁Mission ▁San ▁Francisco ▁Sol ano , ▁founded ▁in ▁Son oma ▁in ▁ 1 8 2 3 . ▁An ▁attempt ▁to ▁found ▁a ▁twenty - second ▁mission ▁in ▁Santa ▁Rosa ▁in ▁ 1 8 2 7 ▁was ▁ab orted . ▁In ▁ 1 8 3 3 ▁the ▁final ▁group ▁of ▁mission aries ▁arrived ▁in ▁Al ta ▁California . ▁These ▁were ▁Mexican - born ▁( r ather ▁than ▁Sp ani ards ), ▁and ▁had ▁been ▁trained ▁at ▁the ▁Apost ol ic ▁College ▁of ▁Our ▁Lady ▁of ▁Gu ad alu pe ▁in ▁Z ac ate cas . ▁Among ▁these ▁fri ars ▁was ▁Francisco ▁García ▁Diego ▁y ▁Mor eno , ▁who ▁would ▁become ▁the ▁first ▁bishop ▁of ▁the ▁Dioc ese ▁of ▁Both ▁Cal if or ni as . ▁These ▁fri ars ▁would ▁bear ▁the ▁br unt ▁of ▁the ▁changes ▁brought ▁on ▁by ▁sec ular ization ▁and ▁the ▁U . S . ▁occupation , ▁and ▁many ▁would ▁be ▁marked ▁by ▁alleg ations ▁of ▁cor ruption . ▁ ▁Sec ular ization ▁▁ ▁As ▁the ▁Mexican ▁republic ▁m ature d , ▁calls ▁for ▁the ▁sec ular ization ▁(" dis est ab lish ment ") ▁of ▁the ▁miss ions ▁increased . ▁ ▁José ▁María ▁de ▁E che and ía , ▁the ▁first ▁native ▁Mexican ▁elected ▁Governor ▁of ▁Al ta ▁California