Longtime U.S. diplomat Robert Zoellick discusses his new book, America in the World: A History of U.S. Diplomacy and Foreign Policy, a sweeping work that ranges from Benjamin Franklin, Alexander Hamilton, and Thomas Jefferson to Henry Kissinger, Ronald Reagan, and James Baker. The book serves as an informative companion and practical adviser to readers seeking to understand the strategic and immediate challenges of U.S. foreign policy during an era of transformation.