Main causes of WWI

The four main causes of WWI were 1.Nationalism- a deep devotion to one's Nation. 2.Alliance System- a formal agreement with other countries to help them when they are in war. 3.Imperialism-building of  power by controlling other countries/colonies. 4.Militarism- Preparation of war.
Nationalism played part when the Archduke of Austria-Hungary was assassinated. Alliance Systems played out because the original conflict was between just two countries but that meant when in war, other countries were to join in and help protect their allies. Imperialism caused initial conflict because countries would fight over who gets which colony. Militarism was a big part because when preparing for war, you basically said were starting it and that put everyone on their toes.

The spark of the war was Assassination of Archduke Franz Ferdinand of Austria in Sarajevo. His death triggered Austria's declaration of war against Serbia.

1.Unrestricted Sub Warfare was when Germany blew up every ship without warning that passed them. This was a problem because they began blowing up many U.S. merchant ships which caused our threat to join in on the war.
2.The Sussex Pledge was Germany's promise to the U.S. to allow merchant ships through. It also promised that they would quit blowing up ships without warning. This gave U.S. a reason to hold their joining of the war off.
3.The Lusitania was a British cruise ship that the Germans blew up killing both Americans and Britain's. This hastened the war for the U.S.
4.The Zimmerman Letter which was a letter from Germany to Mexico attempting to bring them into the war if the U.S. joined in and get us from behind. The letter was intercepted by Britain and brought to our attention. This was one of the if not the last straw that sent the U.S. into the war.

The Treaty of Brest-Litovsk 1918

   The Treaty of Brest-Litovsk was between the Bolshevic government of Russia and the Central Powers(Germany, Austria-Hungary, Bulgaria and Turkey). The treaty was forced on Russia by the Germans figuring they'd get more power from it. However, Lenin (the new Bolshevik ruler of Russia) made the treaty more sutiable for Russia by the terms getting  Russia out of the war so they could focus on establishing it as a communist state. By doing this, Russia and Germany came to agreed terms and signed the treaty on March 3rd, 1918.
   The treaty caused Russia to lose a lot of land. The key provisio The treaty convined the Allies that Russia was not the power they thought it was and convinced many americas entry in the war was correct and necessary in order to stop the German conquest of Europe(both good for Russia and bad for Germany). However, the treaty also freed the German army to place more troups in France.