Just a thought that struck me while going through Amerigo Vespucci's TL - could the US have afforded two simultaneous megaprojects - making the A-Bomb and creating an ICBM (or at least a more powerful version of V2) - during WWII?
Was there political support, military support, the necessary scientific and engineering knowledge (for missile development, we know they had what they needed for the A-Bomb), and most importantly the money for two such grand endeavors?