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1. Security
2. Patriotism and common celebrations (they worked on moral and pride of their people)
3. Since it was a communist regime, they were pursuing equality so there was that middle class that carried the society therefore there were neither extremely rich nor extremely poor people
4. During the period of Vladimir Lenin (Stalin period was too harsh as well as the rest), they had sound economy when the whole world was on its knees. Tactics that were applied by this man were genial and enough to make the USSR stable in the worst period of economical history.
5. Witnesses (elders of Russia) keep saying that the life back in the USSR was the best period of their lives so it somehow must be true
Well the Byzantines' capital of Constantinople was almost completely surrounded by water. This gave them the advantage in anyone tried to invade them. They also built a large wall all around the city with protected the people from outsiders. They also invented Greek fire, which was fire that could not be put out by water. This was extremely useful to attack ships. They also put large chains in the water to prevent ship from getting through.
Baron de Montesquieu, Voltaire, Jean-Jacques Rousseau and Denis Diderot were the 5 famous french philosophers