The United States originally pursued a policy of isolationism, avoiding conflict while trying to broker a peace.
This resulted in increased tensions with Berlin and London.
When a German U-boat sank the British liner Lusitania in 1915, with 128 Americans aboard, U.S. President Woodrow Wilson vowed, "America was too proud to fight" and demanded an end to attacks on passenger ships.
Germany complied.
Wilson unsuccessfully tried to mediate a settlement. He repeatedly warned the U.S. would not tolerate unrestricted submarine warfare, in violation of international law and U.S. ideas of human rights.
Wilson was under pressure from former president Theodore Roosevelt, who denounced German acts as "piracy".
Wilson's desire to have a seat at negotiations at war's end to advance the League of Nations also played a significant role.
Wilson's Secretary of State, William Jennings Bryan, resigned in protest of the President's decidedly warmongering diplomacy. Other factors contributing to the U.S. entry into the war include the suspected German sabotage of both Black Tom in Jersey City, New Jersey, and the Kingsland Explosion in what is now Lyndhurst, New Jersey.
In January 1917, after the Navy pressured the Kaiser, Germany resumed unrestricted submarine warfare.
Britain's secret Royal Navy cryptanalytic group, Room 40, had broken the German diplomatic code.
They intercepted a proposal from Berlin (the Zimmermann Telegram) to Mexico to join the war as Germany's ally against the United States, should the U.S. join.
The proposal suggested, if the U.S. were to enter the war, Mexico should declare war against the United States and enlist Japan as an ally. This would prevent the United States from joining the Allies and deploying troops to Europe, and would give Germany more time for their unrestricted submarine warfare program to strangle Britain's vital war supplies.
In return, the Germans would promise Mexico support in reclaiming Texas, New Mexico, and Arizona.
US declaration of war on Germany:
After the British revealed the telegram to the United States, President Wilson, who had won reelection on his keeping the country out of the war, released the captured telegram as a way of building support for U.S. entry into the war.
He had previously claimed neutrality, while calling for the arming of U.S. merchant ships delivering munitions to combatant Britain and quietly supporting the British blockading of German ports and mining of international waters, preventing the shipment of food from America and elsewhere to combatant Germany.
After submarines sank seven U.S. merchant ships and the publication of the Zimmerman telegram, Wilson called for war on Germany, which the U.S. Congress declared on 6 April 1917.[55]
Crucial to U.S. participation was the massive domestic propaganda campaign executed by the Committee on Public Information overseen by George Creel.
The campaign included tens of thousands of government-selected community leaders giving brief carefully scripted pro-war speeches at thousands of public gatherings.
Along with other branches of government and private vigilante groups like the American Protective League, it also included the general repression and harassment of people either opposed to American entry into the war or of German heritage.
Other forms of propaganda included newsreels, photos, large-print posters (designed by several well-known illustrators of the day, including Louis D. Fancher), magazine and newspaper articles, etc.
The Arming of Europe and the Making of the First World War
First active US participation:
The United States was never formally a member of the Allies but became a self-styled "Associated Power".
The United States had a small army, but it drafted four million men and by summer 1918 was sending 10,000 fresh soldiers to France every day.
In 1917, the U.S. Congress imposed U.S. citizenship to Puerto Ricans as part of the Jones Act, when they were drafted to participate in World War I. Germany had miscalculated, believing it would be many more months before they would arrive and that the arrival could be stopped by U-boats.
The United States Navy sent a battleship group to Scapa Flow to join with the British Grand Fleet, destroyers to Queenstown, Ireland and submarines to help guard convoys. Several regiments of U.S. Marines were also dispatched to France. The British and French wanted U.S. units used to reinforce their troops already on the battle lines and not waste scarce shipping on bringing over supplies. The U.S. rejected the first proposition and accepted the second. General John J. Pershing, American Expeditionary Force (AEF) commander, refused to break up U.S. units to be used as reinforcements for British Empire and French units (though he did allow African-American combat units to be used by the French). AEF doctrine called for the use of frontal assaults, which had long since been discarded by British Empire and French commanders because of the large loss of life
The Complete Illustrated History of World War One: A concise reference guide to the great war that shaped the 20th century, from the State of Europe in ... Line (The Complete Illustrated History of)
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