Diplomatic History Vol. 39, Issue 1, Pages 1-15 January 2015 View on Publisher Site HKS Authors See citation below for complete author information. Fredrik Logevall Laurence D. Belfer Professor of International Affairs Citation Logevall, Fredrik. "Presidential Address: Structure, Contingency, and the War in Vietnam." Diplomatic History 39.1 (January 2015): 1-15.