They dot the landscape in this working-class New Jersey city, popping up every few blocks with names like US Fried Chicken, Royal Fried Chicken and New York Fried Chicken and Burger and giving immigrants a foothold in a new country. One of these fried chicken restaurants, First American Fried Chicken, was thrust into the international spotlight on Monday when authorities arrested the owner’s son, Ahmad Rahami, after a shootout with police. Rahami is suspected of planting several explosives in New York City and New Jersey, including one that blew up on Saturday night in Manhattan and injured 29 people and...