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War (1914-1919) between the Allies ( Russia, Great Britain, France, Italy, the United States) and the Central Powers (Germany, Austria-Hungary and the Ottoman Empire) that ended with the signing if the Treaty of Versailles in 1919.

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Belief that military strength is the source of a nation's security; the policy of building up a nation' military in preparation for war.

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A formal agreement between two or more nations to cooperate for a specific purpose; to aid and protect one another.

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Strong feelings of pride and unity among the people of a nation; belief that a person's greatest loyalty is to a shared culture rather than to a leader or border

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Control of a weak an undeveloped nation by a powerful nation, usually by military force.

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Secret Serbian society formed in 1911 and made up mainly of military officers who used terrorist tactics in an attempt to liberate Serbia from control by the Austria-Hungary and Ottoman Empires

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Major powers allied together to fight against the Central Powers in World War I; France, Great Britain, Italy and Russia ( with the US joining later)

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Major powers allied together to fight against the Allied powers in World War I; Germany, Austria-Hungary and the Ottoman Empires

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System of Warfare in which opposing armies attack and counterattack each other from trenches surrounded by barbed wire

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To equip a military unit with machines or automatic devices, such as modern weapons and vehicles

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Occurs when submarines attack merchant and passenger ships without warning

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Promise given by the German Government to the United States Government (May 4, 1916) to give adequate warning before sinking merchant and passenger ships and to provide for the safety of the passengers

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1919 treaty that officially ended World War I; required Germany to give up land, reduce its military, and pay reparations

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United States President Woodrow Wilson's plan for peace after World War I which would create the League of Nations, prevent secret alliances, disarm militaries, allow for self-determination and limit punishment of Germany

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Germany forced to accept responsibility for starting the war

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Financial compensation paid by a defeated country to rebuild the victorious country

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Self government; government of a region by its own people

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An international organization created in 1920 to promote world peace.