How instrumental was Roosevelt in the Allied victory? He'd guided America through the Great Depression, he changed American society and his post-war vision shaped the world we see today. He knew WWII would be won through alliances, not bloodshed and America's entry into the war changed the game completely.

To examine how and why, Dan is joined by Dr Graham Cross from Manchester Metropolitan University and Professor of Strategic Studies at the University of St Andrews, Phillips O'Brien as they look at Roosevelt's political career and his biggest wartime decisions.

Produced and edited by Dougal Patmore

Phillip's book 'The Strategists' is available now.

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Long road of increases for petrol + diesel vehicles