The cold war was a period of intense geopolitical tension between the United States and the Soviet Union, characterized by a struggle for global dominance that shaped the second half of the 20th century. This era was defined by the constant threat of nuclear annihilation, the rise of opposing political ideologies, and the use of proxy conflicts to expand spheres of influence. It was a time of deep suspicion, espionage, and the creation of a world living in perpetual fear, where the push of a single button could lead to total global destruction.