This book examines the United States and the 27-member European Union (EU), which share a huge, dynamic, and mutually beneficial economic partnership. Not only is the EU-U.S. commercial relationship, what many call the transatlantic economy, the largest in the world, it is also arguably the most important. Agreement between the two partners in the past has been critical to making the world and financial system more open and efficient. Given the high level of commercial interactions, trade tensions and disputes are not unexpected.