WI: Firm Anglo-American alignment by 1880?

Possible PoD: the United Kingdom is broadly pro-Union rather than mixed sympathies, butterflying away most of the tensions post American Civil War - the businesses still sell arms to the Confederacy, but there's no commerce raiders being built, and the optics are much improved even if there's little impact on the war itself. British interests align well enough with American ones if relations are already friendly, and there's enough opportunities for both nations to take the same side in a (probably financial, possibly colonial) conflict to spur an informal alliance.

However it happens, what are the followup effects on world diplomacy? I'd expect German and Italian unifications to be basically unchanged by the PoD, but diplomacy thereafter could be wildly different, and there's conflicts like the Spanish-American War that could be butterflied entirely.
 
Possible PoD: the United Kingdom is broadly pro-Union rather than mixed sympathies, butterflying away most of the tensions post American Civil War - the businesses still sell arms to the Confederacy, but there's no commerce raiders being built, and the optics are much improved even if there's little impact on the war itself. British interests align well enough with American ones if relations are already friendly, and there's enough opportunities for both nations to take the same side in a (probably financial, possibly colonial) conflict to spur an informal alliance.

However it happens, what are the followup effects on world diplomacy? I'd expect German and Italian unifications to be basically unchanged by the PoD, but diplomacy thereafter could be wildly different, and there's conflicts like the Spanish-American War that could be butterflied entirely.

The question is, what is in it for the US? The British and Americans always had a broad alignment of interests but since Britain had ample impulse and means to enforce these alone the US did not have to contribute to it.
 
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