AHC: The US fighting on the side of the Allies by 1915

Second that one; it's the most obvious and probable way.

Lower probability contributing causes include the Germans doing something neutrality- infringingly dangerous;

Christopher Andrew's history of the Security Service references a German attempt at biological warfare in New York in 1917, before the declaration of war; actually a horse poisoning, glanders, intended against horses purchased as draft animals for the Allies.

Clearly they were willing to take risks, and while there is no evidence of earlier attempts, there have been less reasonable PODs.

Unrestricted submarine warfare from the start, though, seems to be the obvious thing.


In terms of effect- America is ready for war sooner, but has to face an undefeated German army, and go through a long, expensive learning process, but the war might be over before 1918, with more American and probably more German casualties, and less generous terms.
 
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In terms of effect- America is ready for war sooner, but has to face an undefeated German army, and go through a long, expensive learning process, but the war might be over before 1918, with more American and probably more German casualties, and less generous terms.

Would this make America much more isolationist post war?

What of Russia? And the rest of the Allies?
 
Isolationism depends, I'd reckon, on how the war is seen in retrospect, and may have more to do with the twenties than the war itself.

In OTL, apart from a few poets, the general mass of the population only started looking at the war as a defeat for civilization, on all sides, during the post war slump, when it started to seem that the war had saved nothing.

As a Brit, looking at the hundred days, won the war and lost the peace seems to sum it up.

Greater American involvement in the war wouldn't change that, but greater involvement in the post war politics might- active participation in the League of Nations might have done a lot to save something from the war.

Depends on domestic American politics of the time, I know a bit but not that much. A bloody shambles of a war would likely increase isolationism; a victory would have the opposite effect maybe.

Russia, though, depends on timing- the revolution was due to happen since 1905, and the Tsarist regime's best chance of avoiding it was keeping the population happy with economic growth, which was not happening-

but a faster defeat of Germany means Russia might hold together a little longer, probably still come apart in the post war slump- but with a much stronger regime not committed to war, and with allies not actively at war, and in a better position to intervene.
 
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