Could dependence on Southern cotton have brought Britain into the American Civil War for the Confederacy?
Short answerNo. Alternative cotton production reduced the economic pressure, emancipation made Confederate support politically untenable, and anti-slavery Royal Navy sentiment favored the blockade.
NotesLost Southern cotton did not make British entry on the Confederate side likely. Egypt and India had already expanded production in the late 1850s because disruption was foreseeable. After the Emancipation Proclamation, support for the slaveholding Confederacy became politically harder to imagine. Royal Navy officers who had served on the anti-slavery West Africa Station would have sympathized with Union blockaders, especially after mid-1863. Alternative supply, emancipation, and naval institutional culture all narrowed the Confederacy's diplomatic options.