The paragraph says, the concept of national security changed and became broader. Why do you think it says that? What does broad mean here?
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Answer:
National security or national defence is the security and defence of a nation state, including its citizens, economy, and institutions, which is regarded as a duty of government.
Security measures are taken to protect the Houses of Parliament in London, UK. The heavy blocks of concrete are designed to prevent a car bomb or other device being rammed into the building.
President of the United States Ronald Reagan in a briefing with National Security Council staff on the Libya bombing on 15 April 1986
Originally conceived as protection against military attack, national security is now widely understood to include also non-military dimensions, including the security from terrorism, minimization of crime, economic security, energy security, environmental security, food security, cyber-security etc. Similarly, national security risks include, in addition to the actions of other nation states, action by violent non-state actors, by narcotic cartels, and by multinational corporations, and also the effects of natural disasters.
Governments rely on a range of measures, including political, economic, and military power, as well as diplomacy, to safeguard the security of a nation-state. They may also act to build the conditions of security regionally and internationally by reducing transnational causes of insecurity, such as climate change, economic inequality, political exclusion, and nuclear proliferation.