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Selective Service Act:  Is an independent agency of the United States government that maintains information on those potentially subject to military conscription.

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Selective Service Act:  Is an independent agency of the United States government that maintains information on those potentially subject to military conscription.

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Zimmerman Note: Was an internal diplomatic communication issued from the German Foreign Office early in 1917 that proposed a military alliance between Germany and Mexico in the event of the United States entering World War I against Germany. The proposal was intercepted and decoded by British intelligence.

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Zimmerman Note: Was an internal diplomatic communication issued from the German Foreign Office early in 1917 that proposed a military alliance between Germany and Mexico in the event of the United States entering World War I against Germany. The proposal was intercepted and decoded by British intelligence.

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Trench Warfare: Is a type of land warfare using occupied fighting lines consisting largely of trenches, in which troops are significantly protected from the enemy's small arms fire and are substantially sheltered from artillery. 

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Trench Warfare: Is a type of land warfare using occupied fighting lines consisting largely of trenches, in which troops are significantly protected from the enemy's small arms fire and are substantially sheltered from artillery. 

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No Man's Land: Is land that is unoccupied or is under dispute between parties who leave it unoccupied due to fear or uncertainty.

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No Man's Land: Is land that is unoccupied or is under dispute between parties who leave it unoccupied due to fear or uncertainty.

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Central Powers: The three major belligerents composing the Central Powers of World War I were Austria-Hungary, Germany, and the Ottoman Empire.

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Central Powers: The three major belligerents composing the Central Powers of World War I were Austria-Hungary, Germany, and the Ottoman Empire.

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Allies: The countries that opposed the Central Powers during the First World War. 

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Allies: The countries that opposed the Central Powers during the First World War. 

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Militarism: Is 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.

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Militarism: Is 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.

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Nationalism: Is a group feeling can be shared Expressed as a belief or political ideology That Involves Identifying an Individual With or becoming attached to one's nation.

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Nationalism: Is a group feeling can be shared Expressed as a belief or political ideology That Involves Identifying an Individual With or becoming attached to one's nation.