Which metal's use led to China's expansion of armies and cultivation of new lands?

Name: Which metal's use led to China's expansion of armies and cultivation of new lands?
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Question

Quizplus · Accepted Answer

Iron was crucial in ancient China for the expansion of its armies and the cultivation of new lands. Its use in weapons and agricultural tools significantly enhanced military strength and agricultural productivity, facilitating territorial expansion and the development of new areas.

Which Metal's Use Led to China's Expansion of Armies and Cultivation