Ronald Robinson’s research while affiliated with University of Oxford and other places

... Zimmern's championing of the ethical goals of Commonwealth contributed in some respects to what Ronald Robinson has termed the moral disarmament of empire in that it established a set of moral standards that could not be maintained in political practice. 69 By the time the British abandonment of the imperial Commonwealth began with the independence of India in 1947, Zimmern had departed for the United States. The last part of his career across the Atlantic was significant for his attempts to reformulate political idealism in the era of the emergence of the United States as a super-power. ...

Reference:

Reinventing Peace: David Davies, Alfred Zimmern and Liberal Internationalism in Interwar Britain