Book excerpt: The relationship between the US and Europe in the 20th century is one of the key considerations in any understanding of international relations/international history during this period. David Ryan first sets the context by looking at the trends and traditions of America’s foreign relations in the 19th century, and then considers the changing nature of America's vision of Europe from 1900 to the present. The book examines America’s response to and involvement in the two World Wars, including the structure of international power after the First World War and American reaction to the rise of Nazi Germany. American/European relations during the Cold War (1945-1970) are discussed, and Ryan considers the contentious debate that America was trying to establish an empire by invitation. Finally, the book looks at the ever-increasing unification of Europe and how this has affected America's role and influence.