The United States and the European Union (EU) economic relationship is the largest in the world—and it is growing. The modern U.S.-European economic relationship has evolved since World War II, broadening as the 6-member European Community expanded into the present 28-member European Union. The ties have also become more complex and interdependent, covering a growing number and type of trade and financial activities. The United States and the EU have embarked on negotiations to establish a free trade agreement—the Transatlantic Trade and Investment Partnership (TTIP).