It is the belief of realistic politics that the acquiring power is the ultimate interest of realistic states.
At an international stage every state is assumed to have independence and act for the motive of power. Every state aims to expand its territory and want to gain power on the world stage by the use of force. Along with this, the security is also the major concern of a realistic state. The power is used to defend one's own territory and to avoid undue invasion. The greater is the covered area of the state and larger is its population; the higher will be the chances for it to offend other states and acquire more resources. The history of religions is also the evidence for the fact that it was the matter of believers' interest to use power for acquiring world resources. It was considered as divine to exercise power on the others and commit atrocities.
For the pursuit of security, a state should be aware of the policies and intentions of other states in the world. In short the realistic perspective advocates for the fact that human nature is conflicting, selfish and competitive, so the principles of realism are the best for mankind to regulate social and political life. Due to prerequisite of power use in realism, the armed forces and strategic planning are the terms that get significant consideration.
As the world progressed by globalization and industrialization, the nations moved away from the realistic principles. Still the traditional and conservative politicians have realistic political approaches but very few of the world nations have a foreign policy based on purely realistic principles. During the pre-Bush period of rule, America had a liberal political approach and never favored direct intervention in any of country's domestic issues. The liberal school of thoughts is based on the economic progress and does not favor the use of power against the countries of the world. The ultimate goal of liberal states is the economic progress which can only take place if the world is not at war and all countries interact and negotiate for the economic gains.
Since World War II somehow, and after United States of America became world's sole super power, it was working for the development and progress of developing nations through financial, educational and other means. United States played a vital role in UNO (United Nation's Organization) to make the goal of poverty reduction in the African countries. It established relationships with all the nations of world on the basis of equality and cooperation. The liberal foreign policy was adopted by USA that allowed it to progress economically.
The balance of power situation only arrives when two competing powers have equal offence and defense powers. The example can be taken of South Asian countries, Pakistan and India which continuously strive to become equal on the power scale. When India became a nuclear power, the power balance in the region tilted towards the Indian state. To overcome this imbalance, Pakistan went for nuclear explosions forgetting the socio-economic development the state needed as India's nuclear power could be a threat to Pakistan's security.
When a group starts to acquire strength by increasing the number of people in the group along with the acquisition of