Kenneth Waltz, the founder of Neorealism, argued that in an anarchic international system, states must prioritize self-help to ensure their survival. He posited that states achieve security by accumulating material power, specifically military capabilities, and by forming strategic alliances to balance against potential threats. His work remains a cornerstone of modern realist political theory.

Neo-classical realism bridges structural realism and foreign policy analysis. It argues that while systemic pressures (like power distribution) are important, domestic variables, including the perceptions and personalities of leaders, are crucial for understanding state behavior. Therefore, the claim that personality is unimportant is rejected, and the objective identification of power is complicated by state-level perceptions.

Political Realism, particularly in the tradition of Hans Morgenthau, posits that human nature is inherently flawed, characterized by selfishness and a narrow focus on self-interest. While power-seeking is a central theme, the specific options provided focus on the psychological traits of individuals. The source answer identifies 'narrow' and 'selfish' as the primary descriptors within this framework.

The Warsaw Pact, established in 1955, was a collective defense treaty signed by the Soviet Union and seven other Eastern Bloc socialist republics. Its primary purpose was to serve as a military counterweight to the North Atlantic Treaty Organization (NATO), ensuring the security of the Soviet sphere of influence in Europe during the Cold War era.

The question asks for a scholar who rejected the necessity of idealism in social science. While E.H. Carr and Reinhold Niebuhr are known for their critiques of utopianism, they often acknowledged the role of moral or idealistic frameworks in political thought. Arnold Wolfers, a prominent realist, focused heavily on power and national interest, often distancing his analysis from the idealistic traditions prevalent in early 20th-century international relations theory.

Realism is a dominant theory in international relations that emphasizes the anarchic nature of the global system. Alongside power dynamics, realism focuses heavily on national security as the primary concern for states. States prioritize their survival and security above other interests, making security the central pillar of realist analysis.

Statements 1, 2, and 3 reflect standard realist critiques of international relations, where ideologies are seen as tools to legitimize state actions. However, statement 4 is generally considered incorrect in political theory, as national interest is typically viewed as the primary driver of state behavior, with ideology serving as a secondary instrument or justification rather than a superior force that consistently overrides core security interests.

Hans J. Morgenthau, a central figure in the realist school of international relations, emphasized that international politics is essentially a struggle for power. His definition focuses on the political interactions between sovereign states and the persistent challenges of maintaining peace within an anarchic international system, as detailed in his seminal work, 'Politics Among Nations'.

The identified works represent significant contributions to the study of disarmament and international security during the mid-20th century. Hedley Bull's 'The Control of the Arms Race' remains a seminal text in strategic studies. These works collectively address the economic and political challenges of managing global military competition, reflecting the academic discourse prevalent during the Cold War era regarding international stability and arms control.

This matching exercise links prominent IR theorists to their seminal contributions. Kenneth Waltz is associated with structural realism; Joseph Nye is famous for 'Power and Interdependence'; Stanley Hoffman contributed significantly to the 'Contemporary Theory of International Relations'; and Nicholas Spykman is renowned for his geopolitical work, 'The Geography of the Power'. The provided mapping aligns these figures with their respective intellectual legacies.