Oops- Somehow I thought AJP Taylor started publishing a decade earlier. So I've edited the 1922 edition of "The second Napoleonic wars" to 1934 (which is when he published his frist work OTL- focusing on Italy in European diplomacy)
To be honest I was surprised he was writing that long ago, as I remember him from my youth in the 70's. Was going to raise the point after checking his wiki entry but you bet me to it.
Going to be pretty chaotic, at least in the former Austrian empire.
A lot of potential problems for just about everybody as so much that could go wrong. Didn't realise there was such tension over Scheswig-Holstein, as thought it was more Bismarck's manoeuvring to get the war he wanted. That could be a nasty factor however if Prussia and a number of German allies are left to fight alone here against a Franco-Russian alliance. Suspect this might force Britain out of neutrality onto Prussia's side, despite the sympathy for Denmark in Britain.
Not sure a US President would take the risk of trying to tangle with Britain at this period, even if they thought it might distract internal divisions. Could be messy for everybody if they did however.