1850-1950 1918-1945 1926 1929 california conditionseconomiques criseeconomique(1929) decrisis depressions economicconditions economichistory generalstrike greatbritain histoire history hulpverlening newdeal openbarewerken politicsandgovernment politiqueetgouvernement unitedstates weltwirtschaftskrise(1929-1932) wirtschaftspolitik