Back in August 1941, and the signature of the Atlantic Charter, Roosevelt hadn’t been ready or able to enter the war. But the situation changed dramatically on 7 December 1941.
Churchill was at Chequers (the Prime Minister’s official country residence) with the American Ambassador and Averell Harriman when news of the Japanese attack on the American fleet at Pearl Harbor came on the radio. Churchill immediately called the President to confirm the news and then on 8 December, Britain declared war on Japan.
The partial involvement of the US and the Pearl Harbor attack led Hitler to declare war on the US three days later. Did Churchill (and Roosevelt) know of the impending Japanese attack on Pearl Harbor? Find out.