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alternatehistory.com
There actually is an argument that the Crimean War contributed signifcantly to the coming of the American Civil War!
"A generally neglected transoceanic linkage concerns the revolutionary effects of the Crimean War in North America, where the wartime shipping and export boom in the United States was followed by the return of Russian grain to European markets, a post-war British credit squeeze on railroad expansion, and the Panic of 1857. The subsequent depression destroyed not only the growing national trade union movement, but also the Democratic Party's old alliance of Northern workers and Southern planters...The less severely affected South gained in the confidence that it no longer needed the Union. Just as important, the Northern workers allied politically for the first time with the Free Soil farmers of the Midwest, capturing for the Republicans first many seats in Congress in 1858 and then the White House in 1860." David M. Goldfrank, *The Origins of the Crimean War,* p. 295. https://books.google.com/books?id=DlfJAwAAQBAJ&pg=PA295
It is absolutely true that in 1858 the Republicans won a number of key northern states they had lost in 1856, and that this paved the way for the winning of the presidency in 1860, and therefore for secession and civil war. Yet it is not clear to me the extent to which the Republican victories of 1858 were the product of the Panic of 1857 (even assuming that the panic would never have occurred had there been no Crimean War)--other things, like the split in the Democratic Party over slavery in the territories and especially over the Lecompton constitution played a role. Still, James L. Huston writes in *The Panic of 1857 and the Coming of the Civil War* that "Several forces operated in the Pennsylvania congressional elections of 1858 that make interpretation of the results somewhat uncertain, yet the statistical and literary evidence tends to confirm the view that the recession spawned by the Panic of 1857 was the predominant factor in the opposition's success..." https://books.google.com/books?id=9ZdjiM3_zF0C&pg=PA162