Islam spread through military conquest, trade, pilgrimage, and missionaries
Answer:
Confucianism is an ethic of moral uprightness, social order, and filial responsibility. Daoism was a philosophy of universal harmony that urged its practitioners not to get too involved in worldly affairs. Legalism is a theory of autocratic, centralized rule and harsh penalties.
It depends how far back you are talking about. If you are talking back to the 1700s it would be cotton. If you are talking about a time period even father back than that, sorry, I can't help. Hope this helped.