Looking at the vote I thought I would be seeing more well thought out strategies on how the US would get involved.
Well I do not see it happening, and here is why.
All the US can do is take a few islands that Britain will take back latter.
That's actually the hardest part, since the Royal Navy will be there in force to prevent attacks on those islands. They'll fall eventually, but for the first year or two (assuming some random early 1910s POD) the US will be on the defensive (on land) and at most will be clearing the way to conquer Canada and the Caribbean (in the Atlantic) at sea by attacking Franco-British commerce and ships.
The US Army is in no position to invade Canada, if so if could look like Napoleon in Russia.
In 1914/15, no, but once the US gears up for war and applies the lessons of the initial fighting, Canada is thoroughly doomed. Canada is not Russia. Montreal is about 55 km from the US border. Toronto is about 50 km if you cross the lake (lake/river warfare, yay), and maybe 130 km by land. Ottowa is 75 km. There are rivers, lakes, and canals available for logistics. Those cities are at the center of the majority of Canadian population and industry in the 1910s. The Maritimes would be secondary since Halifax is very strategic and the terrain is much worse and distances further (although Saint John and Fredericton are each about 90 km from the US border). Western Canada isn't nearly as valuable, but Vancouver and Winnipeg aren't too far from the border.
Nothing comparable to Russia in the slightest. Eastern Europe is far more spread out than the key cities in Canada.
How is America to project power to be involved in Europe, are they invading France.
One, the Royal Navy will be tied down all over the Atlantic. The US could probably use the GIUK gap for shipping, but it's definitely a challenge. I'd expect a lot of naval warfare in the North Sea. I'm not sure there would be a large commitment of American forces in Europe, but on the other hand, the absence of American imports to the Entente will be crippling and probably worth as much as the entire OTL AEF.
Lastly finance, if the DOW is post 1914, any American loans will be defaulted on, that will effect markets.
Definitely a problem, yes, but I'm not too familiar on how bad the effects would be.
Ok one more, Japan takes Guam, Midway and pressures Hawaii.
Not good
Well, for one, Graf Spee's fleet survives, since they can use the American Pacific bases and harass Japan and Britain from there. For two, the US will probably accelerate naval construction by the time the worst of the British threat is over (late 1915). The US won't be able to churn out such a massive fleet like in WWII (this whole war will be a lot harder on the US than WWII, since it will have a lot of fighting on US soil), but I think there will be a realisation that the US's main role in this conflict is naval (to keep the trade to Germany alive, continue to protect American interests globally, and retaking islands lost to Japan). The Pacific is a secondary theater, and I wouldn't be surprised if one or two major victories over Japan would get them to quit the war on favourable terms (for Japan, and for the US too, really). Japan has no need to go down with the sinking Anglo-French ship. Once the Entente is gone from the Caribbean, then a lot of Marines and warships will be available elsewhere, and a lot of them will be going to the Pacific.