There was a lot of discontent in Russia...the peasants, the workers, the
non-Russian national minorities....where you have discontent, you have a
ripe breeding ground for revolution.
Add to it, the Czar's disastrous showing in the field during WW I,
Rasputin being detested by everyone, peasant and noble alike, economic
inflation as a result of WW I, and the growing hatred of the Czar and
all he represented.