We import a lot of the food we eat. Fortunately for farmers, we export a lot, too. We think of endless lines of trucks streaming in across our southern border bringing in fruits and veggies from Central and South America, and that certainly happens. But for longer trips, larger loads, nothing beats shipping by sea. It's more economical and more ecologically friendly. It provides year-round supply of things we've now come to always expect at the supermarket — sweet onions, watermelon, citrus. And critically, it gives U.S. farmers expanded markets for their crops.