CALEXICO, CA - MARCH 14: A recently constructed section of the controversial US-Mexico border fence expansion project crosses previously pristine desert sands at sunrise on March 14, 2009 between Yuma, Arizona and Calexico, California. A top Homeland Security official told a House panel that the department could ultimately respond to escalating violence of warring Mexican drug cartels by deploying military personnel and equipment to the region. 6,290 people were killed in the violence in Mexico in 2008, according to Mexican officials, and more than 1,000 in the first eight weeks of this year. Hundreds of kidnappings in Phoenix during the same time period were blamed on the drug trade. The new barrier between the US and Mexico stands 15 feet tall and sits on top of the sand so it can lifted by a machine and repositioned whenever the migrating desert dunes begin to bury it. The almost seven miles of floating fence cost about $6 million per mile to build. (Photo by David McNew/Getty Images)
