There are two reasons one was to follow after Pancho Villa and 2nd was to start a revolt (someone already asked this question XD)
the Tsar angered Russians because of several factors. He was deemed incompetent and inexperienced. More also he married a very unpopular princess who ended up influencing him. in addition, his family lived lavishly while millions of peasants who also had no say in government remained and became poorer.
The Protestant Reformation, with its antipathy toward received religious dogma, was another precursor. Perhaps the most important sources of what became the Enlightenment were the complementary rational and empirical methods of discovering the truth that was introduced by the scientific revolution.
The period is generally considered to span The 1947 Truman Doctrine to the 1991 dissolution of the Soviet union. The term cold is used because there was no large scale fighting directly between the two superpowers, but day each supported major regional conflicts known as proxy wars
