What is Hemp?
Before people ever thought of using it for anything, hemp grew wild all over Central Asia, India, and East Asia. It's related to cabbage plants. Probably hemp began to grow near where people lived on its own, without any help from people. Hemp likes to grow where the ground has been disturbed, especially on very rich soil. Places where people had been digging up roots and throwing their garbage around were perfect places for hemp to grow, so hemp grew wherever there were people. After a while, people began to notice this plant that was always hanging around and to see how they could make it useful. By about 50,000 BC, in the Stone Age, people in China were already using wild hemp stalks to make string for nets. Eating or smoking hemp leaves as a medicine or for fun probably started about the same time.
By 8000 BC, people in Gordion (modern Turkey) were making hemp cloth. Farmers in China and India were probably the first to grow hemp on purpose, about 4000 BC. They probably grew hemp mainly for the seeds, which you can eat for their oil. But women also wove clothing out of the hemp stalks. In India, people mostly wore cotton clothing, but cotton didn't grow in China, and people there made all their clothes out of hemp or silk. People also made sails for their ships and tents out of hemp stalks. Soldiers and hunters used hemp to make bow-strings. In Central Asia, people like the Scythians also spun their clothes and other string out of hemp.
People in China continued to wear mostly hemp clothing until the Mongols conquered China in the 1200s AD. The Mongols had found out about cotton clothing when they invaded India, and they brought that cotton to China, and encouraged farmers to grow it, so that from then on most people in China wore cotton instead of hemp.