Caterpillar Inc. is telling its American employees in Mexico, particularly those with children, to return to the United States because of escalating violence there, the company said Thursday. About 40 American employees of Caterpillar facilities in Mexico, including in Monterrey, are affected by the company's order. Those employees all are salaried or management, said company spokesman Jim Dugan. "We have been and will continue to monitor and assess the security situation in Mexico and communicate with our employees in order to improve their safety. Based on recent guidance from the (U.S.) State Department, Caterpillar has informed expat employees in some...