In march 1917 there was a revolution, why did this take place?

When war broke out in 1914, the Tsar was at the height of his popularity. However, 3years later, in March 1917, he had been forced to abdicate and 300years of rule in Russia were over.
In 1914, 90% of 130million people were struggling peasants, and despite poor conditions, many were moving to the city to find jobs. Only 1% of this 130million people were rich landowners and factory owners.
Despite these problems, the public still liked the Tsar, and thought Russia's problems were due to the ministers. The tsar had complete control or Russia and the ministers were appointed to help him gov…