re: At full strength who was more powerful in ww2 Germany or US?

Germany couldn't feed itself or power itself without importing food and energy. With so many men in uniform it had to resort to slave labor to keep the factories running, and by 1943 even had to fill it's military ranks with foreign mercenaries. It had no navy to speak of except for U Boats. It couldn't cross the English Channel, much less an ocean. For all it's reputation for mechanized warfare, the army still moved mostly in horse drawn wagons.

Germany was punching above it's weight and did well for a while. But the heavyweight eventually got down to business and That was that.