Hundreds of migrants have showed up at the U.S.-Mexico border. They’re part of a “caravan” that includes about 5,000 people from Central America. The rest of the caravan, as far as we know, is still in central Mexico. But make no mistake. They’ll show up at the border any day now. And no one can agree on what to do with these people. Some say we should just let them into America. Other people, including President Trump, think we should keep the migrants out. In fact, Trump recently called the caravan an “invasion.” Not only that, he deployed thousands of...