Without quoting Mackinder, President Obama and Chancellor Angela Merkel of Germany have recently sought to form a huge free-trade zone that would join Europe with the United States in a new Transatlantic Trade and Investment Partnership, creating an economic power with nearly half of the world’s gross domestic product. On June 19, alongside Ms. Merkel in Berlin, Mr. Obama declared that Europe and the United States were the “engine of the global economy” and that they should “see ourselves as something bigger” in the global quest for freedom, justice and peace.