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First meeting of the League of nations in London
Explanation:  The League of Nations was an international organization, headquartered in Geneva, Switzerland, created after the First World War to provide a forum for resolving international disputes.
Significance: President Woodrow Wilson sought national support for his idea of a League of Nations, the plan for the League of Nations was part of the peace treaty that ended World War One.

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Treaty of Versailles Conference opens
Explanation:  open meetings of all the delegations approved the decisions made by the Big Four. Five major peace treaties were prepared at the Paris Peace Conference
Significance: Negotiations at the Paris Peace Conference were complicated. The United Kingdom, France, and Italy fought together as the Allied Powers during the First World War. The United States, entered the war in April 1917 as an Associated Power. ... Treaty negotiations were also weakened by the absence of other important nations.

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Armistice signed
Explanation: The World War One Armistice between the Allies and Germany was the agreement that ended the fighting on the Western Front in Europe. ... The WW1 Armistice went into effect on the eleventh hour of the eleventh day of the eleventh month on November 11, 1918.
Significance: ^^^^

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Wilson outlines the 14 points
Explanation: was a statement of principles for peace that was to be used for peace negotiations in order to end World War I.
Significance: ^^^^

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Russia withdraws from the war
Explanation: Russia signaled her withdrawal from World War One soon after the October Revolution of 1917, and the country turned in on itself with a bloody civil war between the Bolsheviks and the conservative White Guard.
Significance: ^^^

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October Revolution occurs in Russia
Explanation: leader Vladimir Lenin led his leftist revolutionaries in a revolt against the ineffective Provisional Government
Significance: ^^^

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US troops land in France
Explanation: During World War I, the first 14,000 U.S. infantry troops land in France at the port of Saint Nazaire. The landing site had been kept secret because of the menace of German submarines, but by the time the Americans had lined up to take their first salute on French soil, an enthusiastic crowd had gathered to welcome them.
Significance: ^^^

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US declares war
Explanation: Germany, determined to win its war of attrition against the Allies, announced the resumption of unrestricted warfare in war-zone waters.
Significance:  Woodrow Wilson went before a joint session of Congress to request a declaration of war against Germany.

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First Russian Revolution
Explanation:  in February, overthrew the imperial government

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Germany resumes unrestricted submarine warfare
Explanation: was first introduced in World War I in early 1915, when Germany declared the area around the British Isles a war zone, in which all merchant ships, including those from neutral countries, would be attacked by the German navy.

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Zimmerman note
Explanation: was a secret diplomatic communication issued from the German Foreign Office in January 1917 that proposed a military alliance between Germany and Mexico in the prior event of the United States entering World War I against Germany.
Significance: It proposed to have Mexico enter the war against the US, on the side of Germany.

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Germany calls off unrestricted submarine (u-boats) warfare.
Explanation: was first introduced in World War I in early 1915, when Germany declared the area around the British Isles a war zone, in which all merchant ships, including those from neutral countries, would be attacked by the German navy.
Significance: Germany broke its promise to the United States to stop attacking passenger ships.German leaders knew America entering the war would increase the strength of Allied Powers.

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The Lusitania is sunk
Explanation: less than a year after World War I (1914-18) erupted across Europe, a German U-boat torpedoed and sank the EMS Lusitania
Significance:  occurred on Friday, 7 May 1915 during the First World War, as Germany waged submarine warfare against the United Kingdom which had implemented a naval blockade of Germany.

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World War 1 begins
Explanation: Britain, France, Ireland and Russia were part of an alliance called the Triple Entente, also known as the Central Powers
Significance: Empires were destroyed, millions were killed and the world was upended in a war meant to end all others. On July 28, 1914, Austria-Hungary declared war on Serbia, a move that came a month after the assassination of Archduke Franz Ferdinand in Sarajevo.

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assassination in Sarajevo Explanation: (who was assassinated?)The assassination of Archduke Franz Ferdinand of Austria
Significance: (why was it important?) The killings sparked a chain of events that led to the outbreak of World War I by early August.