Explanation:
The major cause of the Great War was the assassination of Archduke Franz Ferdinand of the Austro-Hungarian Empire in June, 1914, by Gavrilo Princip, a Serbian nationalist. The underlying causes of WWI were nationalism, a form of extreme patriotism and the desire to have independence among the Balkan territories; Imperialism, the desire to take over or gain control of other areas in the world; militarism, the arms race between the major powers; and the Alliance System that was military and defensive which drew all the major powers into the conflict because of their treaties with each other.
There were a lot of reasons the Bolshevik Revolution broke out. Some of these were:
The determination, skills and organisation of Lenin and the Bolsheviks;
-They played no part in the March Revolution-Their leaders were in exile
-They had little influence on the Petrograd Soviet in March 1917
-Lenin's 'April Thesis'-calling for a Workers Revolution
-Popular slogans 'Peace, Bread & Land' and 'All Power to the Soviets'
-The July Days/Rising
-The Kornilov Affair
-Domination of Petrograd Soviet by November 1917-Trotsky was now Chairman
-Lenin's decision to seize power in November 1917
-Bolshevik seizure of power in Nov. 6th/7th 1917-Brilliant organisation by Leon Trotsky
-Gunship 'Aurora'
-First Communist Government in World led by Lenin
Luck/Fortune for the Bolsheviks;
-Conditions of chaos/Misery throughout 1917
-The discontent of the Army Workers and Peasants
-The Kornilov Affair
-Mistakes of Provisional Government
There are obviously a lot of causes, but personally, I think that the weaknesses and the mistakes of the Provisional Government was the most important factor. You might think that another factor is more important, but it's entirely your opinion.
