▁the ▁Port ol á ▁party ▁which ▁had ▁arrived ▁one ▁week ▁before . ▁ ▁Return ▁to ▁Mexico ▁On ▁July ▁ 9 , ▁ 1 7 7 0 ▁Cost ans ó , ▁along ▁with ▁Port ol á , ▁board ed ▁the ▁San ▁Antonio ▁in ▁Mon ter ey ▁Bay ▁to ▁sail ▁to ▁Mexico . ▁There ▁he ▁reported ▁to ▁vic ero y ▁De   C ro ix ▁and ▁inspect or ▁general ▁G ál vez ▁on ▁the ▁successful ▁occupation ▁of ▁Al ta ▁California ▁by ▁the ▁Port ol á ▁expedition ▁parties . ▁ ▁In ▁ 1 7 7 2 , ▁the ▁new ▁vic ero y ▁Buc are li ▁received ▁a ▁pet ition ▁from ▁Juan ▁B aut ista ▁de ▁An za ▁for ▁permission ▁to ▁open ▁a ▁route ▁from ▁Son ora ▁to ▁Al ta ▁California . ▁Buc are li ▁consult ed ▁Cost ans ó ▁on ▁the ▁feas ibility ▁of ▁such ▁an ▁over land ▁route , ▁which ▁aim ed ▁to ▁facil itate ▁the ▁migration ▁of ▁colon ists ▁— ▁including ▁women ▁— ▁to ▁the ▁new ▁Spanish ▁out posts ▁in ▁coast al ▁California . ▁Acc ur ately ▁estim ating ▁the ▁straight - line ▁distance ▁between ▁T ub ac ▁and ▁San ▁Diego , ▁Cost ans ó ▁jud ged ▁the ▁route ▁feas ible , ▁despite ▁mountain ous ▁terrain ▁along ▁the ▁way . ▁King ▁Carlos ▁III ▁approved ▁the ▁plan , ▁and ▁De ▁An za ▁set ▁out ▁from ▁T ub ac ▁on ▁his ▁first ▁expl or atory ▁tre k ▁in ▁ 1 7 7 4 . ▁ ▁Following ▁prev ail ing ▁military ▁reg ulations , ▁Cost ans ó