When the US is completely at peace, there is very little war production, and the Allies get most of it as exports because in peacetime, the US military is really really small.
You've effectively made my argument for me. U.S. maximum capacity was enormous, & I never said otherwise. If the U.S. is at war, much of it is being used to supply an expanded (& expanding) U.S. military, not the Allies.
If the U.S. is at peace, available production capacity is (almost) 100% for Allied supply. Who benefits more from that? Right, the Allies (especially Britain).
If Roosevelt can redirect 10% of the USN's *peacetime* buildup to the British, the British get to completely re-equip all of Coastal Command.
I'd argue slightly differently. A U.S. at peace, with FDR surplussing off what's being
replaced by new production is even better in the immediate term (when Britain really needs it). Like all the 115-odd DDs, for a start. Like the .30-'06 ammo that seems to have kept MacArthur from signing off on a .275 Garand. (Or am I too late...? Hell, do it anyway & rechamber the ones already produced.)
Army. 230 000 men in April 1940, then in September 1940... and 1.4 million by July [1941]
And again, you're making my point: they all have to be supplied, equipped, fed, moved...& that all takes material & vehicles & shipping not available for the Brits (or Sovs).
All the U.S. expansion is in the face of fear Britain would fall, I suspect. Doesn't it make sense for FDR to sell the idea of bolstering Britain, rather than increasing the risk of U.S. "entanglement", given widespread public opposition?
That's not counting the Bomb program, of course. It might need to be carried out in Northern Ontario or somewhere, & wouldn't be spending nearly so much on dead ends (so no US$2 billion pricetag). It might not be done by war's end, either, as OTL...& that means it might be in time for Stalin feeling frisky, & so a major nuclear exchange in Europe around 1953.
(Can you say
The Iron Dream?
)
There is also the fact that GB was running out of manpower, particularly infantry. Montgomery by the end of the war was canabilizing units to get infantry. The US was providing a lot of infantry, where is GB getting it?
There is India, yes, tho even in the midst of the infantry crisis of '44, Britain had something over 5 div (I can't recall the number, or, sadly, the source), untouched, available at home.
Then there's Free France & her colonials...
Canada is problematic, but more French recruiting might encourage more
Quebecois. (Or they might not care at all, & the '44 Conscription Crisis still happens.
)
I'd also add, if you're acutely aware casualties are an issue, you're less inclined to use the manpower you have stupidly, so it's probable wasting men by bombing cities is looked on as a bad idea, & RAF is switched to another, less-lethal, approach (namely, bombing canals & railyards, & mining rivers).
Well, technically, Tsushima was certainly a blue water battle.
Okay, but not by a genuinely blue-water navy. And in a conflict that's really pretty geographically constrained.
Yes, Britain likely could have - but only once it had won the war with Germany, or otherwise extricated itself satisfactorily from it. It would have taken a good deal longer, though.
Given on both counts.
If we're going to consider even syngas & such, let me offer a couple of earlier options: no invasion of IndoChina (cut a deal with Vichy to allow transit?), & no oil embargo (which, AIUI, wasn't meant to be total by FDR, just on the likes of avgas).
Given the U.S. desire to aid China, we're now (likely) in a *Neutrality Patrol situation, just waiting for Japan, or Congress, to blink... (And FDR's head will be spinning so much, he'd make
Regan MacNeil dizzy.
)