This thesis examines the presence of American military personnel in Australia during the Second World War. Around one million US soldiers spent some time in the country. This American occupation resulted in several areas of tension between US military personnel and Australian civilians. Areas of conflict, that have hitherto received little attention from historians, are examined in this dissertation. Jurisdictional and policing disputes between the US military and Queensland officials, American criminal behaviour, and problems between Australian labourers and American authorities are all examined. Other "fault lines," such as race and gender relations, which have been looked at by other historians, are also examined; this thesis provides new insights into these areas. How senior authorities on both sides managed crises and coordinated efforts to manage relations between civilians and Gls are also studied. Sexual relations were directed towards certain associations (prostitution), whilst other associations (marriage) were discouraged. Authorities increased efforts to manage interracial sexual relations, as both countries had a history of discouraging and even outlawing miscegenation. Ultimately, this thesis argues that problems between American personnel and Australians during the occupation did not threaten to upset the war effort or the alliance between the United States and Australia, but there were everyday problems between allies and concurrent efforts to manage relations in the context of a global war. / Thesis / Doctor of Philosophy (PhD)