McPherson
Banned
After the Wilson administration failures, which FDR personally witnessed from the inside, and the NDA of 1920 which was the (mostly; should have given the air farces all to the navy.) Congressional prudent response to it, just what would the Americans do except prototype in their federal arsenals with known tech applicable to tracklaying vehicles and then turn the result over to automotive makers who knew mass production?edit: also, it's worth noting that both those factories still employed the aforementioned train manufacturing techniques rather than the automobile ones of their parent companie