1918- 19thcentury 20thcentury businesscycles capitalism causes competition congresses diplomacy economicaspects economicconditions economicdevelopment economichistory environmentalaspects europe freetrade general government greatbritain history industrialrevolution industry international internationalrelations militaryhistory modern moralandethicalaspects naturalresources peace pol011000pol040020his037000pol011010pol034000 politicalaspects politicalscience poverty socialconditions socialsciences sweden technology unitedstates war world