Dmitri Mendeleev presented his periodic table of the elements based on increasing atomic weight on March 6, 1869, in a presentation to the Russian Chemical Society. While Mendeleev's table was the first to gain some acceptance in the scientific community, it was not the first table of its kind.
In the end, the British sale of opium was used as means for  obtaining more land and trading rights from the Chinese, leading to  the devastation of the Chinese government and economy which is why  The First Opium War will be remembered in history as the time when  China was ultimately betrayed by the British.
Results of the War of 1812 between the United Kingdom and the United States involved no geographical changes. The main result of the war was two centuries of peace between the United States and Britain. All the causes of the war had disappeared with the end of the war between Britain and France and, with the destruction of the power of Indians to block American expansion into the Northwest.