The Fence. The United States has attempted to stem the tide of illegal immigration by
building 700-mile security fence along portions of its border with Mexico. U.S.-Mexican
border extends approximately 2,000, so a 700-miles fence leaves open most of the border area.
The fence,however,is directed at sectors of frequent crossing.The fence is controversial:
Americans are equally divided over it (favor 49 Percent, oppose 48 percent).