The Diplomatic Core: The Determinants of High-Level U.S. Diplomatic Visits, 1946–2010

Face-to-face diplomacy is an important feature of international relations. But when and why do high-level diplomatic interactions occur? We examine different theoretical perspectives using a new dataset of diplomatic visits by the US President and Secretary of State. We argue for assessing these visits along two dimensions. First, we posit that the degree of discretion or constraint in the diplomatic calendar falls along a spectrum. Strategic and domestic factors are at opposite extremes while diplomatic routines fall in the middle. Second, we consider the convergence in the relative influence of these sets of factors across the President’s and the Secretary’s calendars. We develop and test hypotheses about the determinants of visits by the President and Secretary of State across twelve presidencies from 1946 to 2010. Overall, the travels of the President and Secretary converge to serve a set of priorities that derive from a fairly stable set of national interests and from diplomatic routine. We observe that the President effectively retraces the footsteps of the Secretary more than the reverse. We find some evidence of domestic (including individual-level) influences on diplomacy, but only limited evidence that times of crisis produce distinct patterns in face-to-face encounters.