The central powers consisted mostly of nazi Germany, Italy, Japan, Romania, Bulgaria, and Hungary.
Allied powers consisted of United States, Great Britain, Russia (USSR), France, Poland... pretty much the rest of the world. (This is for WW2 if you want WW1 message me or comment on this). Hope this helped!
Answer: 1850. September 9th to be exact.
1. The agreement of Defense Alliance which is contained if one country being attacked then the <span>allies must helping.
2. Imperialism which is mean when a country try to colonize another country to take all the natural resources for themself
3.Militarism which is mean the war of weapon.
4. Nasionalism it caused by Slavia nation in Bosnia and Hergezovina don't want to be a part of Austria-Hungaria, but they want to be a part of Serbia, but mostly every countries in Europe were trying to prove their domination and their power
(sorry my english not really good,,hope you can understand)
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The most important event was obviously the American Civil War from 1861-1865. This led to the 14th Amendment which defined a citizen as "any person born or naturalized in the US." The 13th Amendment abolished slavery, and the 15th Amendment prohibits denying the right to vote to someone because of their race.
Other key events include the Louisiana Purchase, the Texas Revolution, The Spanish-American War, the War of 1812, the purchase of Alaska, the Mexican Cession, the Indian Wars, and the California Gold Rush.
Like I said, the right to vote was extended to all male citizens by the 15th Amendment. Women were not given the right to vote until the 19th Amendment was passed in 1920.