The border
A natural boundary is often times a body of water such as a river. Between the US and Mexico, part of the boundary between these two countries is the Rio Grand River. A political boundary is one created by a treaty or some type of political agreement between two countries. For example, the Dominican Republic and Haiti are on the same island. The boundary between them is a political one established when France ruled Haiti and Spain ruled the Dominican Republic.
The Treaty of Guadalupe Hidalgo settled the boundary dispute between the United States and Mexico.
Rio Grande
Rio Grande
The Rio Grande.
The Rio Grande
Rio grande
The Treaty of Guadalupe Hidalgo
The Rio Grande River.
Mexico.
Rio Grande
The Mexican American War.