Why is the last half of the twentieth century sometimes called 'nuclear age'?

The last half of the twentieth century is often referred to as the "nuclear age" due to the significant advancements and reliance on nuclear technology, particularly in weaponry and energy production. The development and use of atomic bombs during World War II, followed by the Cold War arms race, underscored the geopolitical importance of nuclear capabilities. Additionally, the era saw the rise of nuclear power as a significant energy source, transforming global energy dynamics. This period marked a profound shift in military strategy, international relations, and societal attitudes towards technology and safety.