When we talk about the Second Front, most of us think of the Allied invasion of Northwest Europe—D-Day, June 1944. But in his new book, Second Front: Anglo-American Rivalry and the Hidden Story of the Normandy Campaign, historian Professor Marc Milner offers a different perspective.

What if the real second front wasn't in Normandy, but in Washington?

Milner argues that while Britain fought alongside the United States on the battlefields of Europe, it was also engaged in a very different kind of struggle across the Atlantic: a political and diplomatic battle to retain its influence over an increasingly dominant America.

By the time Allied troops landed in France, the United States had not only become the senior partner in the alliance but had begun reshaping the postwar world, often at the expense of British interests.

But as we'll hear, this wasn't just about wartime politics or military planning. The roots of Anglo-American rivalry ran much deeper, stretching back to the way each nation remembered the First World War.

Joining me to discuss all this is Professor Marc Milner.