Kammala wannan jumla: A lokacin wa'adi na biyu na Shugaba Sam Houston (1841<unk>1844), Dokta Smith ya kasance Minista mai cikakken iko daga Jamhuriyar Texas zuwa Ƙasar Ingila da Ireland da kuma
Faransa, mazaunin London da Paris, bi da bi. Ya kuma je Roma a matsayin wakili na Paparoma Gregory na sha shida. A Turai, Smith ya tabbatar da amincewa da yarjejeniyar abokantaka da cinikayya tsakanin Ingila da Texas kuma ya inganta dangantakar Jamhuriyar tare da Faransa, wanda ake kira Pig War. Bayan dawowarsa daga Turai a 1845, Shugaba Anson Jones ya nada Smith Sakataren Harkokin Waje. Tare da yiwuwar haɗuwa da Amurka Smith yayi aiki don ba wa mutanen Texas zaɓi tsakanin kasancewa jamhuriya mai zaman kanta ko haɗuwa. Don sauƙaƙe wannan, ya yi shawarwari game da wata yarjejeniya, inda Mexico ta amince da 'yancin Texas, wanda aka samu a 1836, kuma a musayar Texas ba za a haɗa ta da wata ƙasa ba. Wannan yarjejeniya, da aka sani da yarjejeniyar Cuevas-Smith, ta fusata da yawa daga cikin Texans waɗanda suka kasance masu goyon bayan haɗin kai, kuma 'yan ƙasa na Galveston da San Felipe sun ƙone Smith a cikin hoto. Wannan yarjejeniya ta ƙi da Texas Congress wanda ya fi son ƙudurin haɗuwa, don haka, Texas ta haɗu da Amurka a ranar 29 ga Disamba, 1845, kuma ta zama jihar 28 na Union a farkon 1846.