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U.S. Congress meets and vote on whether to declare war or not. The vote goes through and President Wilson tells America that U.S. has declared war on Germany.

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A German submarine sinks 4 merchant ships and enrages America as a whole.

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The Zimmerman note is intercepted by Britain, and it is sent to America. The press prints it and sends it out. American people get very angry. The Zimmerman note told Mexico if they helped than they would get their land taken from America back.

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Germany announced to sink any foreign ship they see.

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Woodrow Wilson, who didn't want war, goes against Charles Evans Hughes and Wilson wins 277-254.

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The first ship sunk due to Germany's submarine warfare was the Lusitania, which was sunk on the coast of Ireland. 1,198 people die, including 128 Americans. Because of this, American public opinion was against Germany. After, Germany sunk another ship, called the SS Arabic.  America sends Germany a warning to stop their sinking of passenger ships and Germany accepts. Then they sink the Sussex Ultimatum, in which 80 die and 4  Americans on that ship die.

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Germany starts to use their "U-boats" or submarines and start sinking any foreign ships they see. While doing this, they also sunk passenger ships.

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Trade with American allies reached $2.4 billion. This was because of the war. Many countries needed weaponry, supplies, etc. While buying from America, American bankers lent more than $3 billion. This would turn out to be very good for the economy.

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For the war, the Americans were neutral and didn't want anything to do with the war. Both of the sides asked the U.S. for help, but they were still neutral to joining any side. If to join, most Americans were anti-German, so Britain would be the best option at the time.

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These were the countries that were allies with each other. So one country's war would also be their alliance's war. The countries involved were France, Britain, Russia, Serbia and later Japan, Italy and the U.S.

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These were the central powers. They included Germany, Austria-Hungary and later the Ottoman Empire.

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There were many countries that got involved with the war, even though it started as a small conflict between two nations.

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Archdukes, Cynicism, and World War I: Crash Course World History #36

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Since France was on Britain's coastline, and had relations with them, Britain declared war on Germany.

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Austria declared war against Serbia. Germany declared war against Russia and France.

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Austria-Hungary ask Serbia if they can undergo investigation in their country, and if not, war would ensue. Serbia told Russia to help them and they prepare for war. Austria-Hungary tell Germany and prepare also.

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People believed that their country was right and first for everything and was better than other nations

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Countries were competing for power and territory

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Allies of Serbia fought to protect them and Austria-Hungary fought to help them. Then more and more joined and started a big war

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Countries were competing to have the best/strongest military.

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World War 1 first started off when a terrorist from Serbia assassinated the the Archduke Franz Ferdinand of Austria-Hungary.