50 JULY-AUGUST 2026 | THE FOREIGN SERVICE JOURNAL autocracy and republicanism. Liberal opinion was tilting toward Washington, and it would break decisively so after the Emancipation Proclamation. Public Opinion and the Practice of Diplomacy For a diplomatic historian, the Trent affair marks one of the first instances in Western history in which public opinion played a crucial role in foreign affairs. Before the emergence of republican governments expanded the aperture of public participation in politics, monarchs and ministers enjoyed broad freedom of action in affairs of state. Advances in literacy, the rise of a bourgeoisie, and the growth of newspapers and journals, however, expanded the body politic. At the same time, rapid spread of the telegraph in both countries and the speed with which steamships traversed the ocean created a prototypical version of today’s news cycle, with all the accompanying churn and drama. In 1861 public opinion and a media feeding frenzy was pushing both governments toward war. Beneath the bluster, however, both sides were apprehensive at the prospect of fighting. For the Lincoln administration, conflict with Britain and possibly France presented a worst-case strategic scenario. European recognition of the Confederacy would be disastrous, and actual military intervention on its behalf would be worse. The Union government realized that customary international law contravened Wilkes’ actions, and it now found itself defending actions that it had considered a casus belli against Great Britain in 1812. Wilkes’ intemperate seizure of Slidell and Mason threatened to bring about the very purpose for which the Confederates had dispatched the pair. Britain, however, was itself dismayed at the potential challenges of a major conflict with a rapidly mobilizing United States. Canada was virtually defenseless against a U.S. incursion, and London scrambled to find even a token force of 8,000 troops to Confederate supporters James Mason and John Slidell are removed from the RMS Trent by Union captain Charles Wilkes on November 8, 1861. COURTESY OF THE LIBRARY OF CONGRESS The Union government caught wind of the diplomatic mission and ordered the fleet to intercept the duo. On November 8, 1861, Captain Charles Wilkes of the USS San Jacinto, having learned of the mission via Cuban newspapers, intercepted the Trent and boarded it. After some deliberation, Wilkes seized Mason and Slidell, deeming the pair to be “contraband of war.” Wilkes permitted the Trent to proceed to Britain, but he brought the two envoys as prisoners to Hampton Roads, Virginia. News of the seizure electrified both the United States and Britain, animating public opinion in both countries with righteous anger and patriotic fervor. Emboldened by the ambient Anglophobia of 19th-century America, the U.S. public praised Captain Wilkes. Congress unanimously passed a resolution saluting his conduct. Newspapers and public figures throughout the country extolled the Navy’s actions. Even typically savvy and effective members of Lincoln’s Cabinet welcomed war with Britain, harboring the delusional belief that the conflict would reunite North and South against a common foe. When the news reached London on November 27, British opinion exploded in rage and indignation. Prime Minister Palmerston quickly came under pressure from all parts of the body politic to prepare for war with United States. In an era where “national honor” was a sacred totem to be defended even at the price of war, British papers were uncompromising in the early stages of the crisis. Viewing Wilkes’ action as an outrageous violation of neutral rights little short of piracy, European opinion largely backed London, although each state’s reaction also incorporated its own geopolitical calculations. Tsarist Russia, for example, still recovering from its humiliating defeat in the Crimean War, backed the United States. Though opinion was still malleable at this stage in the conflict, the Civil War was even then assuming a central role in Europe’s century-long social battle between
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