▁for ▁Mexico ▁City ▁until ▁he ▁produced ▁a ▁map ▁of ▁the ▁port ; ▁when ▁leaving ▁he ▁drew ▁a ▁map ▁of ▁the ▁east ▁coast ▁port ▁of ▁Ver ac ru z , ▁as ▁well ▁as ▁a ▁map ▁of ▁the ▁central ▁plate au ▁of ▁Mexico . ▁Given ▁royal ▁authorization ▁from ▁the ▁Spanish ▁crown ▁for ▁his ▁trip , ▁crown ▁officials ▁in ▁Mexico ▁were ▁eager ▁to ▁aid ▁H umb old t ' s ▁research . ▁He ▁had ▁access ▁to ▁José ▁Antonio ▁de ▁Al z ate ▁y ▁Ram í rez ' s ▁Map a ▁del ▁Ar z ob isp ado ▁de ▁México ▁( 1 7 6 8 ), ▁which ▁he ▁de emed ▁" very ▁bad ", ▁as ▁well ▁as ▁the ▁sevent e enth - century ▁map ▁of ▁greater ▁Mexico ▁City ▁by ▁sav ant ▁Don ▁Carlos ▁de ▁Sig ü enza ▁y ▁Gó ng ora . ▁ ▁John ▁Dist urn ell , ▁a ▁business man ▁and ▁publish er ▁of ▁guide books ▁and ▁maps , ▁published ▁Map a ▁de ▁los ▁Estados ▁Unidos ▁de ▁Mé j ico , ▁which ▁was ▁used ▁in ▁the ▁negoti ations ▁between ▁the ▁U . S . ▁and ▁Mexico ▁in ▁the ▁Tre aty ▁of ▁Gu ad alu pe ▁H idal go ▁( 1 8 4 8 ), ▁following ▁the ▁Mexican – American ▁War , ▁based ▁on ▁the ▁ 1 8 2 2 ▁map ▁by ▁U . S . ▁cart ograph er ▁Henry ▁Sch en ck ▁T anner . ▁This ▁map ▁has ▁been ▁described ▁as ▁showing ▁U . S . ▁Man ifest ▁Dest iny ; ▁a ▁copy ▁of ▁the ▁map ▁was