Why Did the Tsar of Russia Abdicate Following the Revolution of 1917 but not Following the Revolution of 1905?

The Tsar abdicated following the revolution of 1917 but he did not abdicate after the 1905 revolution there were a number of key factors which made this happen. The two revolutions did have similarities like the fact that in both revolutions the people 'hit the streets' (went on strike), but the revolutions both had differences, these were the factors that determined the survival and the fall of the Tsar.
In February 1904 war broke out between Russia and Japan in which became known as the Russo-Japanese war. The war was over a town called Manchuria situated in Northern China.
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