Concerns about U.S. credibility are consistently brought up when discussing what foreign policy Washington should adopt, most recently: the development of a strategy with Ukraine, U.S. commitments to Taiwan, and as a response to various attacks on U.S. troops, and shipping in the Middle East. It can be difficult to define or quantify the concept of international credibility, and unlike a state’s more concrete economic or strategic interests, it is defined by the perception of foreign government, existing “only in the eye of the beholder”. Historian Robert McMahon describes it as a “blend of resolve, reliability, believability, and decisiveness.” In sum, the United States cannot be credible unless other states believe that it is credible.
This dynamic around credibility is clear in policy rhetoric addressing key issue areas. Aid to Ukraine is frequently justified on the basis that continued assistance is imperative to credibly maintaining U.S. commitments in Europe and deterring Russia from further aggression. The policy of strategic ambiguity towards Taiwan is consistently undermined by rhetoric that coming to the defense of Taiwan is paramount to demonstrating resolve to East Asian allies and checking Chinese ambitions across the region. The United States is even willing to continue admittedly operationally ineffective strikes against Yemen’s Houthis as a means of proving U.S. resolve.
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