อภิธานศัพท์ประวัติศาสตร์โลกและภูมิศาสตร์

In the early 19th century, Great Britain began importing opium, processed from poppy plants grown in the Crown Colony of India, into China. Chinese officials attempted to ban the importation of the highly addictive opium, but ultimately failed. The British declared war on China in a series of conflicts called the Opium Wars. Superior British military technology allowed them to claim victory and subject the Chinese to a series of unequal treaties.