In world war 2 industrial mobilization was more important. An example of this can be seen with the german reich. Germany at the beginning of the war had stockpiles of equipment to rely on and were a powerhouse that nearly won the war before the United States even entered however as they started getting bogged down their stockpiles dwindled and their industry could not keep up ultimately resulting in their downfall. Another reason for this is the fact it is easier to send allies equipment than it is to send them men.
I think it's Marco Polo used the Silk Road to reach the Mongolian Empire to trade for silk and spices
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