Trench warfare was used extensively during World War 1 as both sides sought to minimize losses by digging trenches and surrounding them with barbed wire. However, trenches had disadvantages as they were muddy, infested with rats and disease. Some of the main causes of World War 1 included nationalism, militarism, imperialism, and alliances between countries that pulled more nations into the war. Key events that drew the US into the war were the Zimmermann Note, where Germany tried to enlist Mexico as an ally against the US, and the sinking of the passenger ship Lusitania by a German submarine that killed over 100 American civilians. By 1918 over 1 million US troops had arrived in Europe under General Pershing and helped

1. The Great War Museum

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4. Trench Warfare The both sides of the war wanted to protect their positions and cut down on losses so they dug trench's. Put barbwire around there trench’s. Trench’s had some disadvantages to like there was mud, rats, smells, rot maggots, lice, and diseases. B A C K

5. Causes of World war 1 Nationalism Militarism Imperialism Alliances B A C K

6. Militarism Militarism- Building up your military. A country may have been building up there military and a other country my of heard about how it was updating and building up there country which made them scared and do the same. B A C K

7. Nationlism Nationalism- Pride in your country. During the war people had pride in there country causing them to get more aggressive about the war. B A C K

8. Imperialism Imperialism- Competing for colonies. The people of Bosnia did like how there were controlled by Austria they felt trapped Serbia didn’t like so they fought so the black hand killed the ruler of Austria and Austria found out who planned and they started and made a lot of people mad. B A C K

9. Alliances Alliances- Forming partnerships with other nations. Which are were if one country goes to war and other country owes them that country will back them up when they go to war which caused more problems and a lot more countries to come in to the war. B A C K

10. The sinking of the Lusitania The Zimmermann Note More

11. Zimmermann Note Zimmermann was a German official. He sent a letter to Mexico asking them to attack the U.S and he said that he would back them up on it and he promised that Germany would aid them in on retrieving some of the land that the U.S took from them. He sent the letter so it would distract the U.S so they would not come in to WW1.

12. Sinking of the Lusitania This ship was a passenger ship that was secretly carrying ammunitions. One of the German submarines sunk the ship it killed 198 passengers and 128 of those passengers were Americans. President Wilson demanded that the Germans should apologize and pay for the damages. B A C K

13. U.S in WW1 Unrestricted Submarines Warfare U.S in WW1

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15. U.S in WW1 General Pershing led the U.S troops to Europe. By 1918 the U.S has 1 million troops in the war The U.S cut off the German rail lines which supply their troops. The U.S attack through Argonne forest it takes 47 days 1.2 million soldiers but the U.S cuts off there supply. By October 1918 German lines are crumbling. In November the Allies have captured the high grounded German surrenders B A C K

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17. Treaty of Versailles 1. Created new countries -Russia: Finland, Latria, Lithuma, Estonia - Austria-Hungary: Czech, Yugoslavic. - Ottoman empire: divided up between allies. 2. Punishes Germany - must take full responsibility and pay for the war $33 billion. 3. Created the league of nations - organization of countries designed to maintain peace and stability.

18. Unrestricted Submarines Warfare Sussex pledge Germany promised not to sink merchant ships without first warning them. By 1917 Germany is defeating Russia in the eastern front. Germans us unrestricted submarine warfare so the could get a quick victory on the western front. B A C K