It would be the US. The US economy sky rocketed after WW2.
The Union victory did solve a handful of problems, it abolished slavery and get rid of the Confederate Union but not every problem could be solved. Personally I would disagree because the Civil War had other problems right after because of the victory.
Russia defeated Napoleon by starving and freezing his army to death. During the invasion, French troops were forced to march through miles of snow in extremely cold weather, without the proper clothing and supplies to survive it. The Russians purposefully burned down their own villages so that the French could not raid them for supplies. By the time Napoleon reached Moscow, his army's morale was extremely low and he had sustained heavy losses, and he was forced to retreat soon afterward. Russia's cold weather that makes it almost impossible to invade is often called 'Russian Winter' or 'General Winter'.
Hope this helps!
The answer for this question would be option A) or the first option.
B. Form a government based on law and reason
