How did the march revolution end the reign of czar nicholas 2

The Czar Nicholas II underestimated the significance of the workers riots in Petrograd (Saint Petersburg) and the Duma established a provisional government, to take the place of the Czar.

Explanation:

The Russian Revolution came as the army was still fighting WWI and through one of the coldest winters. There were food and fuel shortages and economic strife as there was high inflation due to the costly war. The revolution started through work protests and the parliament (Duma) disobeying Nicolas II. The parliament decided to replace the Czar and asked for his surrender. Central to organizing the workers protests were the Bolsheviks (“Ones of the Majority”) who were led by Lenin.

The provisional government after the abdication of the Czar changed a number of times in the chaos following the March Revolution before Alexander Kerensky became the leader of the Provisional Government. But in October 1917, the Bolsheviks and Left Socialist-Revolutionaries staged a coup and occupied strategic points. Kerensky as the provisional government leader tried to resist the Bolsheviks and Left Socialist-Revolutionaries but ultimately had to flee the country.  The Romanov family had been captives since the abdication and they were killed where they were under house arrest by Yakov Yurovsky and his men, who was head of the Bolshevik secret police in 1918.