After the Virginius Incident (http://en.wikipedia.org/wiki/Virginius_Affair) of 1873?
If the Spanish government had been less diplomatic they could have ended up facing the combined forces of the USA and the British Empire... in which case I'd expect the result to be the USA (with British naval support) gaining Cuba & Puerto Rico while Britain took the Philippines (using mainly Indian troops) and perhaps the Marianas (and the rest of Spanish Micronesia?) as well. How Britain would then have reacted to an OTL-like German purchase of any remaining Spainish interests in Micronesia is an interesting question...
Oh, and also in that war, of course, yet another siege of Gibraltar.
If the Spanish government had been less diplomatic they could have ended up facing the combined forces of the USA and the British Empire... in which case I'd expect the result to be the USA (with British naval support) gaining Cuba & Puerto Rico while Britain took the Philippines (using mainly Indian troops) and perhaps the Marianas (and the rest of Spanish Micronesia?) as well. How Britain would then have reacted to an OTL-like German purchase of any remaining Spainish interests in Micronesia is an interesting question...
Oh, and also in that war, of course, yet another siege of Gibraltar.