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I asked Dr. Moser, who provided the following, and permitted me to post it here.
There were some in 1928-29 who suggested that an Anglo-American war was a distinct possibility. The quote itself comes from an issue of Literary Digest (vol. 100, February 9, 1929, pp. 5-7). See also Christopher Hall, Britain, America and Arms Control, 1921-37 (1987), William R. Braisted, "On the American Red and Red-Orange Plans, 1919-1939," in Gerald Jordan (ed.,) Naval Warfare in the Twentieth Century, 1900-1945 (1977), and David Richards, "America Conquers Britain: Anglo-American Conflict in the Popular Media during the 1920s," in Journal of American Culture, vol. 3 (Spring 1980).