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HOME FRONT HELP BRITAIN Industry DEFEND AMERICA More than any previous conflict World War depended on industrial production All countries involved dedicated their factories to manufacturing the goods needed for victory The most important products included aircraft and tanks artillery weapons and ammunition But countries also needed huge numbers of ships and military vehicles along with goods to make sure that civilians on the home front lived reasonably well SPEED PRODUCTION Industry in the United States In the United States the demands of the war finally ended the effects of the Great Depression that had begun in 1929 When the war started in Europe in September 1939 more than 15 per cent of U S workers were still unemployed a normal unemployment rate today is about 5 per cent Even before the United States entered the war some Americans wanted U S industry to help the Allies Britain France and others in Europe LIBERTY SHIPS When German U boats sank British cargo ships U S shipyards produced thousands of vessels to replace them These so called liberty ships were manufactured in a process that engineer Henry Kaiser based on assembly lines in the car industry The ships had standard parts that could be put together by workers with little experience induding many women The speed of assembly rose quickly by the middle of 1942 it took only 80 hours to build a ship and three were being completed every day The Allies were building cargo ships far quicker than the German navy could sink them The liberty ships 2 700 were produced in all helped ensure that the British would not be starved into surrender Liberty ships near completion at a shipyard in California in 1943 The ships panels were joined by welding which was far quicker riveting 6 than