Answer:
A direct result of the Opium War in 19th century China was the signing of the Treaty of Nanjing in 1842. This treaty resulted in several outcomes, including the ceding of Hong Kong to the British, the opening of five Chinese ports to foreign trade, the establishment of extraterritoriality for foreigners, and the payment of a large indemnity to Britain. It marked the beginning of a series of unequal treaties between China and Western powers, which had significant consequences for China's sovereignty and economy.