The politics behind the United Kingdom's vote to leave the European Union sound awfully familiar to the politics that have propelled Donald Trump to the Republican presidential nomination. [...] before saying the victory by the "leave" side is a harbinger of a Trump victory on Election Day in the United States, it's wise to consider the many differences between the two allied nations with historic ties like few others. The "leave" vote was widely seen as a backlash against a recent influx of legal immigrants to the U.K.