Probably the most important change that happened at the time was that C - Women worked jobs that had ben held almost exclusively by men.
Due to the fact that the majority of men, or at least a good portion of them, were on the battlefield in Europe, women had to take over the role in certain key areas that were necessary for the victory of the US.
He restarted the conscription process in Germany and built up Germany’s Air Force and Navy
various religious groups fleeing persecution in europe
Navy, trade (second could be multiple things)
William T Sherman in his march to the sea destroyed railroads to debilitate the confederates supply chains, as well as break the will to fight of the confederates :DDDDD
