Remove grammar mistakes: Since for fifty years, the world lived under the shadow of the Cold War, fearing a fatal confrontation between the US and the Soviet Union, the dissolution of the USSR had a huge resonance not only in the US mass media but also in American society.
So long as for fifty years the world lived under the shadow of the Cold War, fearing a fatal confrontation between the US and the Soviet Union, the dissolution of the USSR had a huge resonance not only in the US mass-media but also in the American society.