I spotted a few days ago a Twitter pointer to Jonathan Dimbleby discussing this book and now the 1hr long YouTube discussion has appeared: The YouTube introduction states (with my emphasis): I only vaguely knew there was a gap between Pearl Harbour and Hitler's declaration of war on the USA. On a quick scan I cannot identify a previous discussion of this period, there a few posts that could - scattered in a few threads. Those caveats aside I know that the USA was taking an active part beforehand in opposing Germany, notably in escorting convoys in the Atlantic and being the "arsenal of democracy".
A review by the historian Andrew Roberts: Link: Books of 2021 From Aspects of History - Aspects of History You have to scroll down to his comment (it is alphabetical).
A short commentary by Charlie Laderman as four historians debate 'Did the Attack on Pearl Harbor Cost the Axis Powers the War' and the sub-title: Four historians consider the consequences of the ‘Day of Infamy’ on 7 December 1941, and whether it was the ultimate reason for Germany, Italy and Japan’s defeat. Link: Did the Attack on Pearl Harbor Cost the Axis Powers the War? | History Today