Anglo-American Unification in 19th Century

I’v been mulling over a new timeline. Basically, the United States and Britain unite in the mid-1800s. I have a bit planned out for after unification, but am not entirely sure about how exactly it will happen. My thought is generally that pan-Anglo-Saxon thought emerges in the 1830s and 1840s and becomes widespread enough that it causes unification, but exactly what events could cause the emergence of the idea and the eventual unification is eluding me.

Does anyone have any suggestions?
 
Such a union is difficult to establish, as it requires a mutually favorable attitude between both countries, which is more likely to result in an alliance and economic ties instead of a full unification, which would cause too many disagreements and is difficult to balance between two large, distant nations.

Maybe there's a customs union between the United States and Britain, which causes the countries to merge economically. The unification, decades and decades later, is only a formalization of this process. That would probably have to wait until the early 20th century, though.
 
I think this is far easier in a world where there are a lot of Americas, rather than one primary one looking to be a rival to Britain. So the constitutional convention failing could be a good POD.

It would also help if Britain doesn't go on to be an oppressive colonial power elsewhere.
 
I'd say the last POD I could see working would be a dramatic British victory in the War of 1812 with the Hartford convention succeeding and New England joining Canada and the Louisiana Territory being ceded to the UK. Eventually revanchists in the US, mostly the remaining Northern states, causes a trade war with the UK resulting in the South advocating to rejoin the British Empire. What's left of the North refuses to do so and Britain doesn't want to add such a large slave-holding territory to its Empire. However the crisis between the slowly-industrializing North and cotton-based South still flares up into a Civil War, prompted by Andrew Jackson's Force Bills. Without New England the war drags on for longer and ultimately Britain intervenes, divides the country in two, and places both halves under British protectorates. By the end of the century the North is full integrated into superCanada while the South and the British Caribbean are consolidated into another major dominion.
 
I read one timeline a monarchist US enters a personal union with the UK following the death of George III, only for the two to unite into "Avalon" later down the road. An American monarchy would certainly help the two unite as there's no Americans complaining about accepting Victoria as their queen. In my opinion a parliamentary US would also help because a compromise between the American and British systems of governance does not have to be reached.
 
Winston Churchill once wrote a story where the Americans, British, and Confederates unified into the English Speaking Association.

If you are willing to change the American Revolution then you could have the Staten Island Peace Conference end with some sort of compromise that the British and the Americans are willing to accept, although that is probably implausible bordering on ASB.
 
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