Mexican troops arrived in Ciudad Juárez and Tijuana this week and will soon patrol 18 cities near the Mexico-U.S. border.

A line of Mexican National Guard and Army trucks are rumbling along the border separating Ciudad Juárez and El Paso, Texas, among the first of 10,000 troops Mexico has sent to its northern frontier fo

As soon as the sun glints over miles of border fence dividing the United States and Mexico, the engines of cargo trucks packed with auto and computer parts roar to life along border bridges and bleary-eyed workers file into factories to assemble a multitude of products geared toward the U.