State the reasons for the discovery of China by Europeans.

The main reasons for the opening of borders by China to Europeans include: the growth of unemployment in the state; increasing poverty; population decline due to hunger and disease; the opium addiction of the Chinese. So, starting from the 19th century, Europeans began to gradually penetrate into the lands of China in order to spread their influence in these territories. One of the pretexts for opening the borders for Western visitors was the opium addiction of the population.