This article examines the United States’ century-long ambivalence towards formal international governmental institutions from 1919, focusing on relations between the United States (US) and the United Nations (UN). The main factor explaining this ambivalence is contested partisan dynamics, personified in the presidency, that have produced a discernible pattern of dissonance between the two major political parties: Democratic presidents are generally supportive of formal international institutions such as the UN, Republican presidents are generally sceptical of them. However, the article contends that the partisan-presidential factor does not sufficiently explain the US-UN relationship. When seen through the lens of four other potential mediating factors – (1) UN secretaries-general, (2) US Permanent Representatives to the UN, (3) the US as host country and New York as host city, and (4) non-state actors that support the UN and US engagement with it – a more nuanced story emerges. Overall, the partisan political picture presented here does not offer grounds for optimism that the longstanding ambivalence the United States exhibits towards the United Nations will stabilise.
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