According to the Border Patrol, the Arizona-Mexico border is the United States' most secure border.

Since October 2013, 57,000 unaccompanied minors, mostly from Central America, have been caught at the border, EFE reports. Of these children, just 6,945 were caught at the Arizona-Mexico border. Meanwhile, 42,358 mothers with their children have been found at the border in the Rio Grande Valley in Texas. Only 3,117 mothers have been caught in Arizona.

Last year marked the first time in 22 years that more undocumented immigrants were detained at the Texas border than the Arizona border despite the influx of unaccompanied Central American children attempting to cross.

"Crossing in this area has diminished quite a lot in the past 10 years," Alejandro Martinez, Border Patrol chief in Douglas, Arizona, said.

For the past 10 years, the number of undocumented immigrants attempting to cross at the Arizona border, which is 388 miles long, has been declining. For example, in 2007, 426,231 migrants were caught at the border. That number has reached just 77, 213 in 2014 thus far.

Members of the Border Patrol believe this decline is due to the U.S. government investing in the border's security. These investments include the doubling of the number of agents stationed there.

"Investments have been made in personnel, infrastructure and technology," Bryan Flowers, Border Patrol spokesman in Tucson, Arizona, said. "We have remote monitoring with cameras that are controlled by the operations center."

In addition, the border features some physical obstacles. A barrier over 20 feet tall covers a big part of the border. There are some areas of the barrier, however, that are only five feet tall.

On Monday, Texas Gov. Rick Perry announced his plan to send up to 1,000 troops to the less secure Texas border in an effort to curb immigrant smuggling and drug cartel activity.
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Follow Scharon Harding on Twitter: @ScharHar.

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