US Army drained the swamps to prevent malaria and yellow fever Army Corps of Engineers built locks to raise ships to an artificial lake and then lowered back to sea level

17
Latin America Roosevelt Corollary to the Monroe Doctrine 1904 T. Roosevelt declared that the US would act as an “international police power” in Latin America Europe can not intervene to collect their debts, the US would act for them Sent troops to Haiti, Nicaragua, Honduras, and the Dominican Republic

23
Causes of World War I Assassination of Austrian Archduke in 1914 Austria invaded Serbia for revenge Existing alliances brought in Russia, Germany, Britain and France into the war New weapons—machine gun, poison gas, airplanes and submarines—prevented either side from winning a quick victory US maintained a policy of neutrality

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Reasons forUS Intervention Close ties to Great Britain and France Allied propaganda—Germany’s invasion of neutral Belgium Zimmerman Telegram—message from German government to return territories to Mexico if they acted against the US Unrestricted Submarine Warfare—sinking of the Lusitania by Germany without prior warning killing 128 American civilians

31
Wilson won support for the war by explaining war was necessary “to make the world safe for democracy.”

32
America at War 1917-1918 Government supervised food and industrial production for the war effort Selective Service Act (1917)—to draft men for the army and any that resisted conscription (draft) faced jail time

38
America at War 1917-1918 Espionage Act—imposed sentences up to 20 years in prison for persons found guilty of aiding the enemy, obstructing recruitment of soldiers, or encouraging disloyalty Sedition Act—imposed harsh penalties on anyone using