The Treaty of Nanking was the first of the unequal treaties that were signed between China and the Western powers following what event?

The Treaty of Nanking was signed in 1842 following the First Opium War between China and Britain. This conflict arose primarily due to disputes over trade, particularly the British export of opium to China, which led to widespread addiction and social issues. The treaty marked the beginning of a series of unequal treaties that favored Western powers at the expense of China's sovereignty.