The answe is <span>Genghis Khan </span>
My answer would be fertile soil.
t’s always going to be an asymmetrical comparison.
Do you compare the Roman empire as its peak with 12th century France or just Roman Gaul? Significant parts of Europe were never under Roman control to begin with and those would have been more advanced in the early middle ages than during Roman times. Besides that many regions of Europe such as Britannia, Gaul, Germania and the Danube region had a low population during Roman times whereas they had a higher one during the Middle Ages.
The Battle of Saratoga. It was a win for the Partriots after they defeated the British in this battle the leader of the British troops, Burgoyne was sent back to England. The win of this battle convinced the French to support the colonists with military aid. The war ended 6 years after this.