For most Americans, D-Day remains the most famous battle of World War II. It was not the end of the war against Nazism. At most, it was the beginning of the end. Yet it continues to resonate 80 years later, and not just because it led to Hitler’s defeat. It also signaled the collapse of the European empires and the birth of an American superpower that promised to dedicate its foreign policy to decolonization, democracy, and human rights, rather than its own imperial prestige.