For him, a close relationship with the U.S. had been a matter not of choice or convenience but of life and death. Britain was faced with Nazi Germany's aggressive attacks across Western Europe in 1940. This was the moment when the new Prime Minister turned his formidable attention to America.
His relationship with the US President was depicted as personal and close, but in reality it was mostly beneficial and gaining. Churchill ‘courted’ Roosevelt into the war with his letters and constant contact, writing to the president every day to secure arms, money and ultimately American troops for the defeat of Nazi Germany. The US was more-or-less neutral until the Japanese attacked Pearl Harbour, because Roosevelt was anxious to know exactly what hitler and Mussolini were after. even though Churchill requested their help even when Calais fell. They agreed to focus on Europe