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One of the many reasons for Northern dominance typically listed when discussing the American Civil War is the population difference, mainly from European emigration into the Northeast. So What If in ATL there's lower emigration from the Old World to the New - possibly due to a more successful 1848, but the reasons themselves don't matter. What I'm wondering is what affect this has on the United States, on the political and economic atmosphere there, and what happens during the Civil War if;
+ there's 10% less European immigrants than IOTL
+ 25%
+ 50%
+ 75%