DBWI: Second American Rebellion is a success

So, a generation after the first Rebellion in 1776, several southern Dominions of North America declared a second one against Britain, this time over the retention of slavery.
OTL the northern Dominions managed to put it down with heavy British support, but what if the British remain tied down in an anti-french coalition? Could this short lived Confederacy succeed?
 
Without the heavy British support, the northern Dominions wouldn't have been willing to fight so hard and sacrifice so many troops. The south was less prosperous , the north was beginning to see them as a economic millstone around their necks.
But it is economics that would cause any kind of southern confederacy to fail. The British could just embargo trade, and the fledging state would soon be begging for re-admittance to the Empire.
 
So, a generation after the first Rebellion in 1776, several southern Dominions of North America declared a second one against Britain, this time over the retention of slavery.
OTL the northern Dominions managed to put it down with heavy British support, but what if the British remain tied down in an anti-french coalition? Could this short lived Confederacy succeed?

TBH, it might be easier to butterfly the Second Rebellion altogether than to have the Southrons succeed; and I agree with the other poster in regards to economics-that would have been a major factor in their probable eventual failure.

The big problem, more than anything, was that the Tories-after years of neglectful misrule-were swept out of power in 1856, allowing the Liberals(the eventual successors to the Whigs, who had died out by the mid 1860s) to take over. And, as we know, the Liberals of the 1850s-inspired in no small part by the idealists and wanna-be revolutionaries on the Continent of the decade prior-very anti-slavery(yet, perhaps ironically, they were also in favor of a rather lighter rule over Britain's possessions, including those in North America.), while the Tories were often ambivalent at best. Had the Liberals not come together-or even formed, the Whigs would still be fairly prominent and the Tories might have continued on for a while instead of being swept out of power until 1880.

And, indeed, it wasn't just in Britain; so too, were the Tories and the Whigs in many parts of North America swept out of power as well. And here's the most ironic bit. Guess were the Tories still largely held on to power? That's right, none other than the Southern Dominions themselves.

And here's another thing that contributed to the outbreak of the rebellion: the exile of Ernest Augustus after the Trafalgar Plot failed in 1847-especially considering how popular he was in the Southern Dominions-was another major sore spot for the Southern Anglo-Saxon elite, many of whom had taken a strong fascination with "Germanic" culture from the 1830s onward.
 
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