This primary source comes from the Collection FDR-MR: Papers as President, Map Room File.
National Archives Identifier:
195028Full Citation: Dean Acheson to Franklin D. Roosevelt; 2/4/1942; Collection FDR-MR: Papers as President, Map Room File. [Online Version, https://docsteach.org/documents/document/dean-acheson-to-franklin-d-roosevelt, May 7, 2024]