▁acting ▁civil ▁governor ▁of ▁the ▁Mexican ▁State ▁of ▁Ver ac ru z . ▁In ▁ 1 9 1 9 ▁Buck ley ▁test ified ▁before ▁the ▁U . S . ▁Senate ▁J oint ▁Sub comm ittee ▁on ▁Foreign ▁Rel ations ▁as ▁an ▁expert ▁on ▁conditions ▁in ▁Mexico . ▁ ▁He ▁then ▁founded ▁the ▁American ▁Association ▁of ▁Mexico ▁( A AM ), ▁a ▁lo bb y ▁group ▁working ▁to ▁am end ▁Article ▁ 2 7 ▁of ▁the ▁Mexican ▁Constitution ▁of ▁ 1 9 1 7 ▁to ▁remove ▁recent ▁restrictions ▁on ▁individual ▁American ▁ownership ▁of ▁land ▁and ▁oil ▁rights . ▁In ▁ 1 9 2 1 , ▁the ▁Mexican ▁government ▁exp elled ▁Buck ley ▁because ▁of ▁his ▁A AM ▁activity . ▁Buck ley ▁reported ▁on ▁his ▁exp ulsion ▁to ▁the ▁U . S . ▁Secretary ▁of ▁State ▁in ▁ 1 9 2 2 . ▁He ▁don ated ▁his ▁papers ▁to ▁the ▁University ▁of ▁Texas ▁in ▁ 1 9 2 3 . ▁In ▁ 1 9 2 4 , ▁President ▁Pl ut ar co ▁El ías ▁Call es ▁invited ▁Buck ley ▁to ▁return ▁to ▁Mexico , ▁but ▁instead ▁he ▁transferred ▁his ▁P ante pec ▁O il ▁Company ▁to ▁Venezuela . ▁ ▁O il ▁spec ulator ▁After ▁he ▁transferred ▁his ▁company ▁to ▁Venezuela , ▁Buck ley ▁fully ▁committed ▁himself ▁to ▁oil ▁expl oration , ▁where ▁he ▁was ▁one ▁of ▁the ▁first ▁to ▁use ▁the ▁" f arm - out " ▁system . ▁This ▁ent a iled ▁Buck ley ' s ▁making ▁agre ements ▁with ▁some ▁of ▁the ▁largest