I'm not sure but I think it's coal mining
The britons had already gone into the iron era which rome was just introduced to. a disadvantage was strategy. the romans were strategically gods.in other words the britons were not great strategists.
Answer:
There were several factors and conditions that led to Détente, including nuclear fears, domestic issues, changes to leadership and policy pragmatism.
The Great Wall
Built by the Chinese in 1750 BC, it helped protect the Chinese people from the Mongolian nomads in the North. Soon, because the protection lasted a long time, the chinese became kind of careless of what was going on. The nomads scaled the wall afterwards, and thats when 'mulan' happened XD anymore questions give me a notification ill be more specific