The history of the European Union (EU) is closely associated with the development of the United States. As the process of European integration has produced institutions and gained a collective international presence, the United States has been a close observer, partner, and often critic of the policies and actions of the EU and its member states. A steady progression of events delineates this path: the Marshall Plan, origins of European integration, the Cold War, the post–Cold War, 9/11 and its effects on the international system, the Great Recession, and the deterioration of global democracy. All throughout, the EU and the United States have both cooperated and collided with one another, in line with the combination of three main factors: (a) the evolution of the EU as an independent, international actor; (b) American strategies for engagement with Europe and then with the EU; and (c) the adaptive capacity and cohesion of the overall transatlantic relationship.
The EU–U.S. relationship is significant not only for the influential role of the EU in world affairs but also because, as opposed to China or Russia, the transatlantic area hosts one of the most solid relationships around the world. Crises surely have been, and will be, a frequent aspect of the intense interdependences on both sides of the Atlantic; however, the level of contestation and conflict is relatively low, particularly as compared with other areas that smoothly allow the flow of goods, services, people, and ideas. Taken altogether, then, the transatlantic relationship possesses a strong foundation: it is integral, resilient, and enduring over a history of diplomatic disagreements and conflicts. The primary question remains just how this steady stream and confluence of shared challenges ultimately will fare in face of evolving crises and systemic disruptors. In any case, the answer is determined by the enduring nature, and foreign policy choices, of the primary actors on each side of the Atlantic.
