Hiroshima and Nagasaki: These are the two Japanese cities that were targeted by atomic bombs dropped by the United States in August 1945. The bombings resulted in significant loss of life and played a crucial role in Japan's surrender.
Nuclear proliferation: Nuclear proliferation refers to the spread of nuclear weapons and technology to other countries beyond those that initially developed them. It has been a concern for global security due to the potential risks associated with nuclear weapons falling into wrong hands.
Arms race: An arms race is a competition between nations to acquire superior military capabilities, often involving the development and accumulation of advanced weaponry. The Cold War between the US and Soviet Union witnessed a significant arms race, including nuclear weapons.