World War I, also known as the First World War, the Great War, or the War to End All Wars, was a ...

1. Russian Revolution- in Russia in 1917 which dismantled the Tsarist autocracy and led to the rise of the Soviet Union.

1.1. Lenin.lenin to comes power- under leadership Russian communist revolutionary Vladimir Lenin.

1.2. Russia Drops out of wwi- on November 1917 was created a Communist government. Germany on the other hand had to remove their army from Russian lands.

2. us entry into war 1817- he American entry into World War I came in April 1917, after more than two and a half years of efforts by President Woodrow Wilson to keep the United States out of the war.

3. unrestricted submarine warfare -sink vessels such as freighters and tankers without warning, as opposed to attacks per prize rules (also known as "cruiser rules").

4. sinking of lusitania- during the First World War, as Germany waged submarine warfare against the United Kingdom which had implemented a naval blockade of Germany.

5. loans to allies- trade with the Allies tripled. This volume of trade quickly exhausted the Allies' cash reserves, forcing them to ask the United States for credit.

6. statemate- a set of tools, with a heavy graphical orientation.

7. divine rights- God's mandate is a political and religious doctrine of royal and political legitimacy.

8. autocracy- is a system of government in which supreme power is concentrated in the hands of one person, whose decisions are subject to neither external legal restraints nor regularized mechanisms of popular control.

9. direct democracy- a system of government by the whole population or all the eligible members of a state, typically through elected representatives.

10. battlefield deaths- The total number of military and civilian casualties in World War I was more than 41 million: there were over 18 million deaths and 23 million wounded, ranking it among the deadliest conflicts in human history.

11. Trench Warefare- a land for fighting lines consisting a large military trenches. Troops protected the enemy's.

12. Russia Drops out of wwi- on November 1917 was created a Communist government. Germany on the other hand had to remove their army from Russian lands.

13. balance of power- theory in international relations suggests that national security is enhanced when military capability is distributed so that no one state is strong enough to dominate all others.

14. two front war- fought against French, British, Belgian, and (later) American forces on the Western Front

15. zimmerman note- Germany and Mexico in the prior event of the United States entering World War I against Germany.

16. militarism-the belief or desire of a government or people that a country should maintain a strong military capability and be prepared to use it aggressively to defend or promote national interests.

17. cult of offensive- strategic military dilemma, where leaders believe that offensive advantages are so great that a defending force would have no hope of repelling the attack.

18. Absolute monarchy- or despotic monarchy, is a form of monarchy in which one ruler has supreme authority.

19. blocktrade- is a permissible, noncompetitive, privately negotiated transaction either at or exceeding an exchange determined minimum threshold quantity of shares, which is executed apart and away from the open outcry or electronic markets.