Europe, though a small continent in terms of geography, encompasses some 50 nations and territories comprising the world's largest economy. From the North Atlantic coast to the shores of the Caspian and Mediterranean Seas, Europe includes converging and diverging political, economic, and cultural histories, alliances, and ideals. U.S. relations with Europe and its multifaceted nations, peoples and institutions—such as NATO and the European Union—are among the most comprehensive and strategically important partnerships in the world.