In 1917 the rule of the Romanovs over Russia collapsed and Tsar Nicholas was forced to abdicate. He then offered the throne to his brother, who refused. There were many causes to the collapse of the Tsarist regime in 1917, including the First World War.
Russia entered the First World War for different reasons, including: to improve Tsar’s reputation in front of people after losing the Russo-Japanese war, to get influence and respect in Europe, to get land which is rich in resources (including a warm port) and, maybe, to reduce population and therefore it will be easier to deal with famines. And at first Russia was winning battles and was processing, until at the battle of Tannenberg the progression stopped. Moreover, in 1915 Tsar Nicholas assumed personal command over the army. This would mean that now the blame (or fame, if he would have won) would have been put on him. The Tsar resulted to be a poor commander, and soon the army was lacking basic resources such as rifles, millions of people were dying. The people became demoralised, thousands of men deserted. Now, without the support of the army, the Tsar was in a bad and unpleasant (and slowly worsening) situation.
Another cause of the happenings of 1917 was the discontent of the workers and peasants. Though it may not be less important than World War I, it definitely has killed and injured less people. The discontent of the workers and peasants has been since the start of the industrialization of Russia, before 1900. By 1900 20% of workers were living in major cities, in which the living conditions were awful, pays were low. Eve though strikes were illegal and were stopped by the royal army and lots of people were killed, the strikes didn’t stop. The peasants’ life had the same quality. Although they were allowed to buy small amounts of land, most then resold it and became