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Há 1 dia · Strategic Defense Initiative. The Strategic Defense Initiative ( SDI ), derisively nicknamed the Star Wars program, was a proposed missile defense system intended to protect the United States from attack by ballistic nuclear missiles. The concept was announced in 1983, by President Ronald Reagan, [1] a critic of the doctrine of mutual assured ...
Há 8 horas · Africa. Africa is the world's second largest and second-most populous continent after Asia. At about 30.3 million km 2 (11.7 million square miles) including adjacent islands, it covers 20% of Earth 's land area and 6% of its total surface area. [7] With 1.4 billion people [1] [2] as of 2021, it accounts for about 18% of the world's human ...
Há 8 horas · By association, artillery may also refer to the arm of service that customarily operates such engines. In some armies, the artillery arm has operated field, coastal, anti-aircraft, and anti-tank artillery; in others these have been separate arms, and with some nations coastal has been a naval or marine responsibility.
Há 1 dia · Western culture, also known as Western civilization, European civilization, Occidental culture, or Western society, includes the diverse heritages of social norms, ethical values, traditional customs, belief systems, political systems, artifacts and technologies of the Western world. The core of Western civilization, broadly defined, is formed ...
