El Rio Grande
Rio Grande river
The Rio Grande
Rio Grande
Rio Grande River
The spanish and the texans who claimed to then be there own rebublic.
Texas
Appalachian mountains
REMEMBER THE ALAMO!
Yes. The boundary between the continents is the southern boundary of Panama, which meets the northern boundary of Colombia.
The African Boundary The southern boundary of the tropics is the Tropic of Capricorn.
Mexico claimed that the Nueces River was the boundary between the two nations while the US maintained that the Rio Grande was the boundary. As clear boundary definitions were never established, some skirmishes occurred on this no-man's land, resulting in American blood shed, and used as casus belli by President Polk to start the Mexican-American War (1846-1848).