The main argument in favor or slavery as an institution during this time in the US was that black people could not take care of themselves and that they would fall into chaos if allowed to go free. Another argument was that many were already enslaved in Africa and were living better lives in the US.
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Germany emerged from the First World War defeated and in political and economic turmoil. The economy was ruined and the Kaiser had fled the country. The Weimar government, set up after the War, was having trouble controlling the country and was very unpopular for accepting the Treaty of Versailles
The current de facto capital of Japan is Tokyo, with the seat of the Emperor, National Diet and many government organizations.