Answer:
First of all, it's spelled Tsar. and now for the answer, there were many events that led to overthrow the Tsar, for example, the working class was very tired of non-equal pay and very bad working conditions. (Trust me, Russians have a very low standard.) This lead to the rise of opposing leaders, that are a bit nicer towards the working class such as the provisional government, and the communist party leader, Lenin.
Step-by-step explanation: