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Unrestricted submarine warfare- a type of naval warfare in which submarines sink vessels such as freighters and tankers without warning.
A German U-boat had sunk the British passenger ship the Lusitania at great loss of life. Unrestricted submarine warfare was suspended following public outcry in the US, but was reinstated in 1917. This eventually led to the American declaration of war on Germany.

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Wilson wanted the U.S to enter war because he didn't want the U.S to lose their power of say in European countries.

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Propaganda- a kind of biased communication designed to influence people's thoughts and actions. The government set up the nation's  first propaganda agency, the Committee on Public Information (CPI), to popularize the war. The head of the CPI was a former muckraking journalist named George Creel. Creel's propaganda campaign was highly effective. But while the campaign promoted patriotism,  it also inflamed hatred and violations of the civil liberties of certain ethnic groups and opponents of the war.

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Zimmerman Note - A telegram from the German foreign minister to the German ambassador in Mexico that was intercepted by British agents. It proposed an alliance between Mexico and Germany and promised that if war with the United States broke out, Germany would support Mexico in recovering "lost territory in Texas, New Mexico, and Arizona."

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Moral diplomacy was proposed by president Wilson, and it was a system in which countries only who have their moral beliefs analogous to their nation.

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British propaganda spread some stories about the Germans. This was later proved to be false.

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This political cartoon shows the "gap in the bridge," which it seems that America has something to do with. The sign says that it was designed by the president of the U.S.A, and uncle Sam-America's Icon- seems to have given up.

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The U.S senate votes 82 to 6 to declare war against Germany, and The United States House of Representative 373 to 50, and then America formally enters WWI

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America's economic ties were much stronger with the Allies than the Central Powers.

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President Wilson, who was elected president in 1916, vowed to America that we would stay neutral in World War 1. Britain and Germany made this impossible.

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Even though many Americans wanted to stay out of the war, several factors made American  neutrality difficult to maintain. As an industrial and imperial power, the United States felt many of the same pressures that had led the nations of Europe into devastating warfare.

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On April 6, 1917 The U.S joined allies; Britain, France and Russia, to fight in WWI, which was commanded by Major General John J. Pershing. Even though many american's were opposed to the U.s entering WWI because they wanted to remain neutral.

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The image above shows a newspaper when the United States entered the war. It talks about president Wilson signing the resolution, to agree to have America fight in the war.

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They tried desperately to stay neutral and out of the war, but America's ties to Britain (both practically and culturally) pushed the U.S., to getting involved.

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The U.S entered Britain, France, and Russia (the allies), however many Americans wanted to stay neutral.