The causes of the First World War are : 

(i) Military Policy of Russia : The Russian Government considered Germany to be the main threat to its territory. This led to huge fight between Russia and Germany. 

(ii) Arms Race : Arms race is one of the major cause for the First World War. The world was divided into two 

groups : Triple Alliance, Tripple Entire and there was a competition for storing weapons. 

(iii) Aggressive Nationalism : And there was nationalism in whole of Europe. Entire Europe was divided into groups and there was keen competition between the European countries. 

(iv) Role of Newspaper : The newspaper played a major role by publishing the various factors of the two groups. This increased the gap between the two powers. 

(v) Immediate cause : The immediate cause for the First World War was the murder of the Austrian Prince Archduke Ferdinand. 

Results : 

(i) Lots of people were killed and millions of people were injured. 

(ii) It overthrew the old kingdoms. 

(iii) After the First World War, a large number of nations started to prevent further wars. 

(iv) The Treaty of Versailles was signed which ended the First World War. 

(v) After the First World War, the countries like Poland and others got independence.