There's been lots of speculation about what would happen if the US never got involved in WW1, but much less about the oppose scenario, i.e., the US getting involved much earlier in the conflict. So let's say that the US isn't as isolationist in the early 20th century, is more eager to expand its overseas holdings, and consequently is more involved in the pre-WW1 system of alliances, specifically on the British/French/Russian side. My questions are:
(1) What difference would this have on German planning in the run-up to/early stages of the war? IOTL they didn't expect Britain to intervene, so a fortiori I don't think they'd expect America to intervene ITTL, either. So would they still be as gung-ho about getting involved in a potential war? Or would the potential of US involvement, even if they don't expect it to be realised, make them more hesitant, perhaps deterring them from pledging support to Austria-Hungary against Russia in the first place?
(2) Assuming war still breaks out, and the US declares war on Germany in August 1914, how does the war pan out with the US being involved from the get-go?
(1) What difference would this have on German planning in the run-up to/early stages of the war? IOTL they didn't expect Britain to intervene, so a fortiori I don't think they'd expect America to intervene ITTL, either. So would they still be as gung-ho about getting involved in a potential war? Or would the potential of US involvement, even if they don't expect it to be realised, make them more hesitant, perhaps deterring them from pledging support to Austria-Hungary against Russia in the first place?
(2) Assuming war still breaks out, and the US declares war on Germany in August 1914, how does the war pan out with the US being involved from the get-go?