THESE DAYS MOST SWISS CHEESE consumed in the U.S. is made in Ohio, but our palettes—and ham sandwiches—ultimately have that tiny European country to thank. More specifically, the cheese, which only Americans refer to by its generic name, owes much of its success to the Alpine climate and terrain. Swiss cheese is so easy to slice and keeps for such long periods because Swiss farmers of yore had so much trouble selling the product during the brutal winter months.