Two liberal democracies with a long history of alliance and shared values begin a significant arms buildup against each other after a major shift in the global distribution of capabilities. Structural realism's explanation would be:
ATheir leaders have become more aggressive — leadership character is the primary driver of conflict
BTheir shared liberal values have eroded, removing institutional constraints on power competition
CThe anarchic structure compels self-help regardless of shared values — when capability distribution changes, states must respond to structural incentives even among allies
DEconomic interdependence has broken down, removing the material incentives for cooperation
Structural realism's defining move is locating causation at the system level, not the unit level. Waltz's theory explicitly predicts that even friendly, democratic states must pursue security and relative power when structural conditions demand it — their domestic character and mutual affinity are unit-level variables that the structure overrides. This is what makes neorealism distinctive and controversial: it predicts security competition among states that 'should' cooperate based on any unit-level theory. Options A and B are exactly the unit-level explanations that Waltz argued are insufficient because they cannot explain consistent patterns across different leaders and regimes.
Question 2 Multiple Choice
What was Waltz's key methodological critique of Morgenthau's classical realism, and what did he propose instead?
AMorgenthau was too focused on economics; Waltz shifted attention to military capability
BHuman nature is constant and therefore cannot explain variation in state behavior — Waltz proposed the system's structure as the independent variable instead
CMorgenthau overstated the role of international institutions; Waltz argued states are more constrained by them
DMorgenthau failed to account for nuclear weapons; Waltz updated realism to incorporate deterrence theory
Waltz's central methodological objection was scientific: if human nature is constant (all leaders share the same drive for power), it cannot explain why state behavior varies across different historical periods or system configurations. A good causal theory requires a variable that actually changes. Waltz proposed the anarchic structure of the system — specifically its polarity and the distribution of capabilities — as the explanatory variable. This shift from unit-level (human nature, domestic politics) to system-level (structure) explanation is what makes neorealism 'structural' and distinguishes it from classical realism.
Question 3 True / False
According to Waltz's structural realism, states prefer to bandwagon with a rising hegemon rather than balance against it, because joining the winning side maximizes security.
TTrue
FFalse
Answer: False
Waltz argued the opposite: balancing is the expected behavior, and bandwagoning is rare. States fear domination by a hegemon more than they fear the costs of balancing. A state that bandwagons grants the rising power unchecked capability and risks being exploited or absorbed later. Balancing — joining a countervailing coalition — limits the hegemon's power even at some cost. This prediction distinguishes structural realism from power transition theory and is tested against historical cases like the coalitions against Napoleon and Wilhelmine Germany.
Question 4 True / False
Waltz argued that bipolar systems (two dominant great powers) are more stable than multipolar systems because there are fewer potential miscalculations about threats and alliance commitments.
TTrue
FFalse
Answer: True
This is one of Waltz's most specific and controversial predictions. In a bipolar system, each superpower clearly knows its primary adversary, can monitor it closely, and need not rely on uncertain ally commitments. In a multipolar system, shifting alliances create ambiguity about who will balance whom in any given crisis — the kind of miscalculation Waltz believed contributed to World War I. The Cold War bipolarity, despite its tensions, never escalated to great-power war — a fact Waltz pointed to as confirming the structural stability of bipolarity.
Question 5 Short Answer
Why can structural realism explain consistent patterns of state behavior across different historical eras with very different leaders and domestic regimes?
Think about your answer, then reveal below.
Model answer: Because structural realism locates causation at the system level — anarchy and the distribution of capabilities — rather than in the intentions or values of individual leaders or regimes. Structure selects for security-seeking behavior: states that fail to accumulate sufficient relative power are conquered or marginalized, so the system is systematically populated by states that prioritize survival. Leaders with very different personalities face the same structural constraints and therefore respond similarly. A democratically elected leader and an authoritarian both operate under anarchy and must account for their state's relative position. The structure produces regularity in outcomes even when the units vary enormously.
This is deliberately analogous to how competitive market structure produces similar profit-seeking behavior from firms regardless of their CEOs' personalities. Waltz borrowed this logic from microeconomics to give IR theory a more rigorous, parsimonious structural foundation.