How to write a paper about the closed door of Qing Dynasty and the opening to the outside world of Tang Dynasty?
First, write the pros and cons of the Qing dynasty's closed-door policy and your opinion, then write the pros and cons of the Tang dynasty's opening to the outside world and your opinion, and compare the advantages of the Tang dynasty's opening to the outside world: the friendly exchanges between the Tang dynasty and other countries strengthened the economy and developed science and technology. This was caused by the closed-door policy of the Qing Dynasty. Just sum it up at last!