Commentary As we watch the horrifying Russian attack upon Ukraine, Americans everywhere are grateful for the peace that comes from the protection of two oceans and the world’s most powerful military. Our unique position as a continental power with only two land borders has long been a source of our security. In his 1838 address to the Young Men’s Lyceum of Springfield, Illinois, Abraham Lincoln expressed it well when he said: “All the armies of Europe, Asia, and Africa combined, with all the treasure of the earth … could not by force, take a drink from the Ohio, or make a track on the Blue Ridge, in a trial of a thousand years.” It was true then, when the United States was young, and it is even more true now, when we are a globe-spanning superpower. Nevertheless, to borrow a phrase, freedom isn’t free—and so, we must ask ourselves what …