Like most Americans, Bill Jordan drives to work. But unlike most, his commute involves an international border crossing.Every day, he drives from his home in southeastern Arizona to Calexico, Calif., where he crosses into Mexicali, Baja California. He comes to supervise a manufacturing plant here for his employer, a small Phoenix-based company called Allied Tool & Die, that makes niche aerospace parts.Twenty years after the North American Free Trade Agreement was signed, cross-border ties are becoming increasingly important to manufacturing on the continent. These days, some six million American jobs depend in some way on trade with Mexico, according to the Woodrow Wilson International Center for Scholars’ Mexico Institute.via Arizona manufacturer sees Mexico as key to growth |...