/r/askhistorians
Prior to repealing Prohibition, Congress changed the Volstead Act’s definition of an alcoholic beverage from 0.5% ABV to 3.2% ABV. Many states today still have this restriction on beer. What made them settle on 3.2%?
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How much was Henry Ford himself responsible for the development of the modern assembly line? Was he a businessman who just took credit from a team of employees, or was he really spearheading the technical innovation?
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Where did early adopters of the automobile get gas? Was there much of a transition phase where cars were sold before infrastructure or standards were in place?
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"Black Syphilis" - Tales are rife of a horrific unknown STD infecting US soldiers in Vietnam, causing genitals to turn black and decay. Is there any truth to that? NSFW
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How frequently did wartime leaders such as Churchill, Roosevelt, or Stalin take days off work during the war, and how did they avoid burnout working >=16 hour days every day for 5+ years?
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