20 pts.
what did china do to prevent other countries from creating their own silk?

the production of silk originates in china in the neolithic (yangshao culture, 4th millennium bc). silk remained confined to china until the silk road opened at some point during the later half of the 1st millennium bc. china maintained its virtual monopoly over silk production for another thousand years. not confined to clothing, silk was also used for a number of other applications, including writing, and the color of silk worn was an important guide of social class during the tang dynasty.

explanation:

united states reinforcements contributed greatly to three allied victories in france at: cantigny (first major american battle), argonne (the largest in the united states military history, involving 1.2 million american soldiers), and château-thierry (one of the first actions under general pershing).