He was the last Tsar of Russia because the Russian people were frustrated with his lack of military competence. Under his reign, Russia lost the Russo-Japanese war of 1905. After this embarrassing military defeat, Nicholas II assumed personal control of the military efforts. During World War I, with the Tsar as the head military general, the Russians still lost some key battle causing the people and the soldiers to lose faith in his ability to lead.
The people of Russian were displeased about entering WWI in general because they thought, and rather correctly, that the only reason why they were fighting was because of previous diplomatic alliances entered into by the Tsar.
While away at the front, Nicholas II left his wife in charge of the domestic government issues. His wife Alexandra was of German descent and the people thought she was a German spy during World War I.
Because of disloyalty of the army, economic turmoil, public starvation, and an ailing son (Alexei heir to the throne was a hemophiliac), Tsar Nicholas II of Russia abdicated the throne on March 14th, 1917. Government was handed over to his brother who refused the throne unless the people should elect him to be King. Instead, a provisional government was established. This is known as the February Revolution of 1917, though the revolution really happened in March according the Gregorian calendar.
As a side note: This really had nothing to with the Bolsheviks and Mensheviks just yet, that was the October Revolution of 1917.
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That would be Nicholas II, who abdicated for himself AND his son in 1917. He and his family were killed by the Bolsheviks afterwards.
Nicholas II Romanov was the Tsar during World War 1 until he abdicated the throne in March 1917.
The Russo-Japanese War (Which Russia lost - making Nicholas unpopular with the Russian people) World War I (but the Tsar abdicated and was murdered before the war's end)
There were two czars (or 'tsars,' depending on the system of transliteration) by the name of Nicholas. Nicholas I, whose reign lasted from 1825-1855, was the son of Tsar Pavel (also Romanized as "Paul") I. Nicholas II, the last ruling tsar, who abdicated the throne in favor of the provisional government in 1917, was the son of Tsar Alexander III.
Tsar Nicholas II of Russia was officially overthrown when he abdicated the throne on March15, 1917. His political power had effectively ended a few days before that, so the abdication was but a formality. This was probably done in a futile effort to save the lives of himself and his family. It was in vain however as he and all of his family were executed on July 17, 1918.