THE BORDER COVERS 2000 MiLES!

"Today, the U.S.-Mexico border covers 2,000 miles, encompassing four U.S. and six Mexican states. But the area has changed quite a bit over the years. In the pre-Columbian era, the land was inhabited by Native Americans who did not draw border lines. Find out how the area changed through the colonization of the Americas, the discovery of gold, wars, immigration, NAFTA and other historical events." (from website http://www.pbs.org/kpbs/theborder/history/index.html) this is exactly what we are looking for because our question is mainly how did the border eveolve & how was it before the border was put up so this short paragraph gave a little more idea on how the border is & we are looking forward to looking more into this.