    national security is the requirement to maintain the survival of the state through the use of economic power, diplomacy, power projection and political power. 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: * using diplomacy to rally allies and isolate threats * marshalling economic power to facilitate or compel cooperation * maintaining effective armed forces * implementing civil defense and emergency preparedness measures (including anti-terrorism legislation) * ensuring the resilience and redundancy of critical infrastructure * using intelligence services to detect and defeat or avoid threats and espionage, and to protect classified information * using counterintelligence services or secret police to protect the nation from internal threats ==definitions== there is no single universally accepted definition of national security. the variety of definitions provide an overview of the many usages of this concept. the concept still remains ambiguous, having originated from simpler definitions which initially emphasised the freedom from military threat and political coercion to later increase in sophistication and include other forms of non-military security as suited the circumstances of the time.{{cite book |title=national security: imperatives and challenges |last=paleri |
National_security Political_terminology