1. Nationalism -  Devotion and loyalty to one's own country; patriotism. http://dictionary.reference.com/browse/nationalism?s=t
2. Imperialism - The policy of extending the rule or authority of an empire of nation over foreign countries, or of acquiring and holding colonies and dependencies. http://dictionary.reference.com/browse/imperialism?s=ts
3. Treaty of Versailles - The treaty imposed on Germany by the allied powers in 1920 after the end of World War 1 which determined exorbitant reparations from the Germans. http://www.thefreedictionary.com/Treaty+of+Versailles
4. Idealism vs. Realism - Idealism - practice of forming ideals, especially unrealistically. Realism - practice of accepting a situation as is, and being prepared to deal with it accordingly. http://answers.yahoo.com/question/index?qid=20110425044306AARUDzW
5. Fourteen Points - a statement in 1918 by US president Woodrow Wilson that the great war was being fought for a moral cause and for postwar peace in Europe. http://en.wikipedia.org/wiki/Fourteen_Points
6. Self- determination - The right of a nation or people to determine its own form of government without influence from outside. http://www.thefreedictionary.com/self-determination
7. War Guilt Clause - The allied and Associated Governments affirm and Germany accepts the responsibility of Germany and her allies for causing all the loss and damage to the Allies. http://en.wikipedia.org/wiki/Article_231_of_the_Treaty_of_Versailles
8. W.C.T.U. - Woman's Christian Temperance Union - the first mass organization among women devoted to sovial reform with a program that "linked the religious and the secular through concerted and far-reaching reform strategies based on applied Christianity. http://en.wikipedia.org/wiki/Woman's_Christian_Temperance_Union
9. League of Nations - It was an intergovernmental organization founded as a result of the paris peace conference that ended the first world war. It's goal was to maintain global peace. http://en.wikipedia.org/wiki/League_of_Nations
10. Collective Security - A system of maintaining world peace and security by concerted action on the part of the nations of the world. http://www.thefreedictionary.com/collective+security
11. Woodrow Wilson - Thomas Woodrow Wilson (December 28, 1856 – February 3, 1924) was the 28th president of the United States in office from 1913 to1921. http://en.wikipedia.org/wiki/Woodrow_Wilson
12. Economic Sanctions - Economic sanctions are domestic penalties applied by one country (or group of countries) on another country (or group of countries). Economic sanctions may include various forms of trade barriers and restrictions on financial transactions. http://en.wikipedia.org/wiki/Economic_sanctions
13. Hoare-Laval Plan  - Secret plan to offer Benito Mussolini most of Ethiopia (then called Abyssinia) in return for a truce in the Italo-Ethiopian War. It was put together by British foreign secretary Sir Samuel Hoare and French premier Pierre Laval, who tried and failed to achieve a rapprochement between France and Italy. http://encyclopedia2.thefreedictionary.com/Hoare-Laval+Plan
14. The Locarno Pact - Locarno Pact, 1925, concluded at a conference held at Locarno, Switzerland, by representatives of Great Britain, France, Germany, Italy, Belgium, Czechoslovakia, and Poland. http://www.infoplease.com/encyclopedia/history/locarno-pact.html
15.Kellogg-Briand Pact  - The Kellogg–Briand Pact was a 1928 international agreement in which signatory states promised not to use war to resolve "disputes or conflicts of whatever nature or of whatever origin they may be, which may arise among them". http://en.wikipedia.org/wiki/Kellogg%E2%80%93Briand_Pact
16.Washington Conference - The Washington Naval Conference, also called the Washington Arms Conference or the Washington Disarmament Conference, was a military conference called by President Warren G. Harding and held in Washington from 12 November 1921 to 6 February 1922. http://en.wikipedia.org/wiki/Washington_Naval_Conference
17. Bourgeoisie - The members of the middle class. http://www.merriam-webster.com/dictionary/bourgeoisie
18. Proletariat - The term used to describe the class of wage-earners (industrial workers). Their only possession is their ability to work. http://en.wikipedia.org/wiki/Proletariat
19. Exploitation  - The use or manipulation of another person for one's own advantage. http://www.thefreedictionary.com/exploitation
20. Dictatorship of the Proletariat - In Marxism, rule by the proletariat—the economic and social class consisting of industrial workers who derive income solely from their labour. http://www.britannica.com/EBchecked/topic/162253/dictatorship-of-the-proletariat
21. Cadet - A cadet is a member of the historical Russian political party. http://cadet.askdefine.com/
22.Bolshevik - member of a wing of the Russian Social-Democratic Workers’ Party, which, led by Lenin, seized control of the government in Russia (October 1917) and became the dominant political power. http://www.britannica.com/EBchecked/topic/72272/Bolshevik
23. Menshevik - The Mensheviks were a faction of the Russian socialist movement that emerged in 1904 after a dispute in the Russian Social-Democratic Labour Party between Vladimir Lenin and Julius Martov, leading to the party splitting into two factions, one being the Mensheviks and the other being the Bolsheviks. http://en.wikipedia.org/wiki/Menshevik
24. October Manifesto - is a document that served as a precursor to the Russian Empire's first constitution, which would be adopted the next year. http://en.wikipedia.org/wiki/October_Manifesto
25. Fundamental Laws - The Russian Constitution of 1906 refers to a major revision of the 1832 Fundamental Laws of the Russian Empire, which transformed the formerly absolutist state into one in which the emperor agreed for the first time to share his autocratic power with a parliament.
http://en.wikipedia.org/wiki/Russian_Constitution_of_1906
26. Duma - The Duma were council assemblies which were created by the Czar of Russia. Simply, it is a form of Russian governmental institution that was formed during the reign of the last Tsar, Nicholas II. 
http://en.wikipedia.org/wiki/Duma
27. Provisional Government -  is an emergency or interim government set up when a political void has been created by the collapse of a very large government. http://en.wikipedia.org/wiki/Provisional_government
28. V.I. Lenin - was a Russian communist revolutionary, politician and political theorist. He served as the leader of the Russian SFSR from 1917, and then concurrently as Premier of the Soviet Union from 1922, until his death. http://en.wikipedia.org/wiki/Vladimir_Lenin
29. Joseph Stalin - was the de facto leader of the Soviet Union from the mid-1920s until his death in 1953. http://en.wikipedia.org/wiki/Joseph_Stalin
30. Leon Trotsky - was a Russian Marxist revolutionary and theorist, Soviet politician, and the founder and first leader of the Red Army. http://en.wikipedia.org/wiki/Leon_Trotsky