Many manufacturing cities have arisen along the over 3,200-mile U.S.-Mexican border. Near the Pacific Ocean, San Diego's Mexican sister city Tiajuana is home to 530 foreign owned factories; just below Texas, Juarez has 320 such factories; and placing third is Mexicali with more than 150.
橫亙三千二百多公里的美墨邊境，於是產生不少工商大城：瀕臨太平洋，和美國聖地牙哥互為姊妹市的提瓜拿市，有五百卅家外資廠商；與德州接壤的朱瑞茲有三百廿家；墨西加力則以一百五十餘家居第三位。