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The Treaty of Guadalupe Hidalgo settled the boundary dispute between the United States and Mexico.
The border
Most of the Mexico-Belize border is defined by the Hondo River (Spanish: Rio Hondo).There is however, a Rio Hondo located in the US State of New Mexico, but it doesn't define any boundary with the country of Mexico.
newdiv
Mississippi
Rio Grande
The Rio Grande river.
Rio Grande
Rio Grande
Rio Grande
The Rio Grande.
It is the southern border for Texas; conversely, it is the northern border for Mexico.