Supposedly, to keep illegal immigrants, criminals and terrorists out of the United States.
Supposedly, to prevent Mexican illegal immigrants from reaching US soil.
It has been already built. See related links.
To the US-Mexico border? Northern Mexico is close to the border.
when did the US close the border beween Mexico and the US
Yes, Mexico does border the U.S
When Mexico lost the battle at the Alamo
US-Mexico border ("Frontera Mexico-Estados Unidos").
The two countries that border the US is Canda (to the north of the US), and Mexico (to the south of the US).
Mexico-US Border
None. Mexico's border touches New Mexico's state limit (and US border).They share a common border.
US-Mexico border
Tijuana is right at the US-Mexico border.