Who was responsible for the cold war - the united states or the soviet union? and how/why?

Neither.

Explanation:

Red Dawn from the 80's had a good explanation. The Slavs and the Yanks were like the 2 strongest guys in a neighborhood. Sooner or later, they would have had to fight, just like 2 middle schoolers fighting to see who's stronger.

your answer would be 12 stories

the noble might have thought that the system was far because they had lot of things and riches and the serf would have thought that the feudal system was un fair because of the way they were treated.