>At 4:30 a.m. on April 12, 1861, Confederate troops fired on Fort Sumter in South Carolina's Charleston Harbor. Less than 34 hours later, Union forces surrendered. Traditionally, this event has been used to mark the beginning of the Civil War.
Now, it would've been a lot nicer if they didn't start a war over it, but slavery was done for one way or another and everyone knew it.
I mean, in an alternate universe where the modern cloture rule existed and somehow at least one extra free state was admitted while the South was not paying attention to block it, sure, that’s almost plausible, but...
They progressively outlawed slavery over the course of 1870 through 1890 without a civil war. The US probably could've done just about the same over a shorter period (because the US was richer and could have paid its way through a lot of the opposition faced in Brazil).
Brazil had the same Constitution, Senate Rules, and balance of power between slave and free states as the pre-Civil War USA?