The Atlantic Archive holds hundreds of documents generated by various British entities that examine the United States during this conflict. This repository enables “…researchers to establish a detailed understanding of British opinions towards the US within political, economic and social frames. The government reports include, for example, the British Embassy in Washington, D.C. reports on Franklin D. Roosevelt’s controversial decision to run for president a third time in 1940.” You can search by title, governmental institution, geographic location, and many other entry points. This site provides a fascinating look at how the British viewed the United States.
British Documents on the United States During World War 2