This lends support to the theory that Iturbide 's opposition had U.S support and influence behind it .
Iturbide 's government was notoriously harsh in turning down territorial negotiations with agents of the United States ' government , as attested by Joel Poinsett .
This lends support to the theory that Iturbide 's opposition had United States support and influence behind it .
Iturbide 's government was notoriously harsh in turning down territorial negotiations with agents of the United States ' government , as attested by Joel Poinsett .