Alliance System of World War I

1. Alliance System of World War I

2. Serbia Austria- Hungary Alliance System of World War I

3. Serbia Austria- Hungary 6/1914, assassinated Archduke Franz Ferdinand Alliance System of World War I

4. Serbia Declared war 7/1914 Austria- Hungary 6/1914, assassinated Archduke Franz Ferdinand Alliance System of World War I

5. Serbia Declared war 7/1914 Austria- Hungary 6/1914, assassinated Archduke Franz Ferdinand Allies Russia Alliance System of World War I

6. Serbia Declared war 7/1914 Austria- Hungary 6/1914, assassinated Archduke Franz Ferdinand Allies Agreed to protect Serbia Russia Alliance System of World War I

7. Serbia Declared war 7/1914 Austria- Hungary 6/1914, assassinated Archduke Franz Ferdinand Allies Allies Agreed to protect Serbia Russia Germany Alliance System of World War I

8. Serbia Declared war 7/1914 Austria- Hungary 6/1914, assassinated Archduke Franz Ferdinand Allies Allies Agreed to protect Serbia Russia Germany Declared war 8/1914 Alliance System of World War I

9. Serbia Declared war 7/1914 Austria- Hungary 6/1914, assassinated Archduke Franz Ferdinand Allies Allies Agreed to protect Serbia Russia Germany Declared war 8/1914 Allies France Alliance System of World War I

10. Serbia Declared war 7/1914 Austria- Hungary 6/1914, assassinated Archduke Franz Ferdinand Allies Allies Agreed to protect Serbia Russia Germany Declared war 8/1914 Allies Agreed to help Russia France Alliance System of World War I

11. Serbia Declared war 7/1914 Austria- Hungary 6/1914, assassinated Archduke Franz Ferdinand Allies Allies Agreed to protect Serbia Russia Germany Declared war 8/1914 Allies Invaded neutral zone 8/1914 Agreed to help Russia France Belgium Alliance System of World War I

12. Serbia Declared war 7/1914 Austria- Hungary 6/1914, assassinated Archduke Franz Ferdinand Allies Allies Agreed to protect Serbia Russia Germany Declared war 8/1914 Great Britain Allies Invaded neutral zone 8/1914 Agreed to help Russia France Allies Belgium Alliance System of World War I

13. Serbia Declared war 7/1914 Austria- Hungary 6/1914, assassinated Archduke Franz Ferdinand Allies Allies Agreed to protect Serbia Russia Germany Declared war 8/1914 Great Britain Pledged to protect Belgium and declared war Allies Invaded neutral zone 8/1914 Agreed to help Russia France Allies Belgium Alliance System of World War I

14. Serbia Declared war 7/1914 Austria- Hungary 6/1914, assassinated Archduke Franz Ferdinand Allies Allies Agreed to protect Serbia Russia Germany Declared war 8/1914 Great Britain Pledged to protect Belgium and declared war Allies Invaded neutral zone 8/1914 Agreed to help Russia Allies France Allies Belgium Japan Italy Alliance System of World War I

15. Serbia Declared war 7/1914 Austria- Hungary United States 6/1914, assassinated Archduke Franz Ferdinand Allies Allies Agreed to protect Serbia Russia Allies Germany Declared war 8/1914 Great Britain Pledged to protect Belgium and declared war Allies Invaded neutral zone 8/1914 Agreed to help Russia Allies France Allies Belgium Japan Italy Alliance System of World War I

16. Serbia Declared war 7/1914 Austria- Hungary United States 6/1914, assassinated Archduke Franz Ferdinand Allies Allies Agreed to protect Serbia Russia Allies Germany Bombed four American ships Declared war 8/1914 Great Britain Pledged to protect Belgium and declared war Allies Invaded neutral zone 8/1914 Agreed to help Russia Allies France Allies Belgium Japan Italy Alliance System of World War I

17. Serbia Declared war 7/1914 Austria- Hungary United States 6/1914, assassinated Archduke Franz Ferdinand Declared war 4/16/1917 Allies Allies Agreed to protect Serbia Russia Allies Germany Bombed four American ships Declared war 8/1914 Great Britain Pledged to protect Belgium and declared war Allies Invaded neutral zone 8/1914 Agreed to help Russia Allies France Allies Belgium Japan Italy Alliance System of World War I

18. Ottoman Empire Serbia Declared war 7/1914 Austria- Hungary United States Allies 6/1914, assassinated Archduke Franz Ferdinand Declared war 4/16/1917 Allies Allies Agreed to protect Serbia Russia Allies Germany Bombed four American ships Declared war 8/1914 Great Britain Pledged to protect Belgium and declared war Allies Invaded neutral zone 8/1914 Agreed to help Russia Allies France Allies Belgium Japan Italy Alliance System of World War I