Robert Trager’s Diplomacy: Communication and the Origins of the International Order focuses on the role of communication in diplomacy with emphasis on the role of costless exchanges such as private discussions between two foreign policy ministers versus costly signaling such as moving troops to the frontier of an adversary or a drone strike on a hostile paramilitary force. Trager makes use of two related datasets from the Confidential Print of the British Foreign Office’s communications between 1855 and July of 1914 with emphasis on detailed case studies on significant historical events including the negotiations leading to the outbreak of World War I.

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