Lots of nations were fighting smaller wars as well and more of them than the United States and yet none of them devolved down from Company to individual fireteams as the manoeuvre unit before 'Wipers'That's the thing, the US is doing 'small wars' tha t teach different lessons, with MOUT or Fighting In Someone's House, than large set pieces with thousands.
In thus TL, they learn about the ACW, but have moved on to the expected US Battles, small units against other small units, and do better with lots of portable firepower- as was needed in Cuba in 1898
More 6mm Lee and .351SL can be carried than 30-40Krag or 30-03. The Lee is flatter shooting and more accurate, while being a fast straight pull action than the Turnbolt Kragen or the Mauser with the serials filed off, Springfield.
I doesn't work for me - maybe a Platoon evolution where you have a scout/bomber squad with a mix of grenadiers and M1907 armed men, then 2 rifle squads with a couple of Grenade cup equipped rifles, then finally a Machine gun squad with a pair of LMG (Lewis?) teams and ammo bearers/runners.
The Lees are fine guns, I always wondered why straight pulls were not more popular?
I am not so sure about the Model 1907 though, I appreciate that its a bit of a Darling on AH.com