Answer:
1.World War one was started by the Assignation of the Archduke Francis Ferdinand.
2. The black hand was the group that killed him.
3. Countries then started taking sides and forming alliances
4. Austria-Hungary then declared war on Serbia and WWI started
5. 4 topics/ideas that led to WWI were: Imperialism, Alliances, Nationalism, and Militarism.
6. The war started and it was also known as the Great War
7. Trench Warfare was a major strategy used to fight and the conditions were bad and scary. The land between the trenches was called "No mans land"
8. Things like poison gas and machine guns were introduced into the War
9. Another strategy they used was total war.
10. There was a Russian revolution, the United States then joined the war, and then after a lot of fighting the war ended. On Nov. 11 1918 at 11 am the War was finally done when they signed the Treaty of Versailles.
Step-by-step explanation: