Ammonia Cleaning. One way to bring out the colors and the shine in a diamond is with 1 part straight ammonia and 3 parts warm water. You can swirl the ring around in the solution for a couple of minutes. If it is still dirty, you can also use a soft bristled brush to continue to clean an engagement ring.
Iraq War. Russian President Vladimir Putin listens to a question at the Kremlin in Moscow, Oct. 18, 2007. President Vladimir Putin, in his latest jab at Washington, suggested Thursday that the U.S. military campaign in Iraq was a pointless battle against the Iraqi people, aimed in part at seizing the country's oil reserves.
History is continuous. So there is no one war/ event that is most influential. Maybe you can split into centuries and then call the wars/ events most influential at that time. The 21st century is ongoing and so far the Iraq war has had some influence. In the 20th century, WW1 and WW2 have been most influential.