BTW, the oil and steel embargoes were Executive Orders, no input from Congress needed.
Just another example of Presidential over-reach ;-) FDR couldn't have gotten it thru Congress I suppose. The majority of Congress before Dec 1941 wanted nothing to do with the war in Asia or Europe. But not out of pacifism ... puleese. The US had a prepared war plan to go to war against the British Empire to steal Canada, until 1939.
I don't think the Quakers and other pacifists, would have numerically made a difference. My own father's father was pro-German, as was my mother's family (being German-American). The Ford Motor Company, IBM, the bankers associated with J P Morgan etc including Prentice Bush, were heavily involved in industrial development in Germany, especially Prussia/Silesia. Also Lindbergh was pro-German. IBM was responsible for the tabulating machines that facilitated the roundup of Jewish people in Germany. Henry Ford was a raving anti-Semite, Hitler gave him a hero of industry award and kept a signed photo. Until after WW II, the Americans were more into eugenics and anti-Semitism than the Germans. Joe Kennedy Sr was one of the German lovers too ... JFK had to be assigned to the Pacific, to get him away from German femme fatales operating in London.
Until long after Japan invaded China, China's principle ally was Germany, not the US. Nationalist Chinese troops wore German helmets when defending Singapore against the Japanese. But everyone "played" China ... getting their feat wet, but not seriously involved. Stalin's support, on again, off again, for the Chinese communists, didn't bear fruit until late in the war. It was because everyone had given up on China, in 1940 (9 years after the initial invasion of Manchuria), that Hitler switched sides to Japan, who had traditionally been allied to GB.
Now post-facto ... I certainly agree with the embargo on Japan. But that is cheating. The Japanese could have wiggled free, but their egos trapped them, just like pride trapped the German leadership.