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The Gadsden Purchase. Purchased to provide the Southern Pacific RR with a southern route across the Rocky Mountains.
If the question means USA for America then Mexico is on the southern border of the USA.
The eleven "Southern" states that seceded from the Union were all "slave" states. The slave holding states of Missouri, Kentucky, Maryland and Delaware were termed to be "border" states and geographically, none of them can be describes as "Southern" states, especially Delaware.
Mississippi.
Border? It is on the southern US border.
The Country that shares the southern Border with the US is Canada.
The southern border of the US is primarily located along the countries of Mexico.
Mexico is the country on the southern border of the United States.
The US state of South Dakota is the southern border of North Dakota.
The U.S. southern border is formed by Mexico and the Gulf of Mexico.
Rio Grande forms the Southern border of the United states.
Northern border is Canada Southern border is Mexico
Mexico
Mexico
The U.S. southern border is formed by Mexico and the Gulf of Mexico.
The U.S. southern border is formed by Mexico and the Gulf of Mexico.