Answer:
The need to have better protection led to innovations in tools and weapons.
Explanation:
The Warring States Period is the name given to the period in Chinese history between the 400s BC and the 200s BC. The period was characterized by wars between a number of relatively small states, and ended when China was united by the Qin Dynasty.
The greatest technical innovation of the Warring States period was the introduction of iron tools. Not only in handicrafts, but also in agriculture and military equipment, iron became the predominant material instead of bronze.
