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.
Answer by Ethan Yang. Confidence votes 49. Causes and Effects of the French and Indian War. 1st cause-The first cause of the French and Indian War was Mercantilism because France and Britain were fighting over territory and so they can get wealth and power. 2nd cause - (Fur trade) - The British wanted to take over the French trade and basically just move in on it.