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Security measures taken to protect the Houses of Parliament in London, UK. These heavy blocks of concrete are designed to prevent a car bomb or other device being rammed into the building.
President Reagan in a briefing with National Security Council staff on the Libya Bombing on 15 April 1986

National security is a concept that a government, along with its parliaments, should protect the state and its citizens against all kind of "national" crises through a variety of power projections, such as political power, diplomacy, economic power, military might, and so on.

The concept developed mostly in the United States after World War II. Initially focusing on military might, it now encompasses a broad range of facets, all of which impinge on the non-military or economic security of the nation and the values espoused by the national society. Accordingly, in order to possess national security, a nation needs to possess economic security, energy security, environmental security, etc. Security threats involve not only conventional foes such as other nation-states but also non-state actors such as violent non-state actors, narcotic cartels, multinational corporations and non-governmental organisations; some authorities include natural disasters and events causing severe environmental damage in this category.

Measures taken to ensure national security include:


National security sections
Intro   Definitions    Origin    Elements of national security    Country-by-country perspectives    National security state    References    Further reading   External links  

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