It also feared that Britain might lose its great power status and its influence in world affairs .
It feared resurgence of United States isolationism , as had occurred after the First World War , in which case Britain might have to fight an aggressor alone .
United States also feared that Britain might lose Britain 's great power status and its influence in world affairs .
It feared resurgence of United States isolationism , as had occurred after the First World War , in which case Britain might have to fight an aggressor alone .