Disclaimer. Don't rely on these old notes in lieu of reading the literature, but they can jog your memory. As a grad student long ago, my peers and I collaborated to write and exchange summaries of political science research. I posted them to a wiki-style website. "Wikisum" is now dead but archived here. I cannot vouch for these notes' accuracy, nor can I say who wrote them.
Wendt. 1992. Anarchy is what states make of it: The social construction of power politics. International Organization 46 (spring): 391-425.
We should not necessarily treat interests and identity as given. Although Wendt agrees with a statist view, he argues that an important field of research should treat state interests and identity as the dependent variable. Wendt concedes that there are those who study how first- and second-image factors affect state identity and interests; he wants us to study how anarchy affects state identities and interests.
Realism's shortcoming is its failure to do this (although Wendt agrees that realist game theory is entirely appropriate in situations where we can assume that identities are constant, at least in the short term). Neoliberalism's failure is that it has sought to explain cooperation by focusing on process, but it has not sufficiently accounted for systemic variables. Constructivism's failure is that it gets too bogged down in epistemological debates without looking enough at how identities are formed in practice.
In short, we need a combination of neoliberalism and constructivism that will study how the system affects state identities and interests.
This article explores "three ways in which identities and interests are transformed under anarchy [Y]: by the institution of sovereignty [X1], by an evolution of cooperation [X2], and by intentional efforts to transform egoistic identities into collective identities [X3]." I gather that Wendt doesn't intend for these three variables to tell us everything that anarchy does to identity. Instead, he is looking at three different things that can happen under anarchy to affect identity. The strong implication is that there is more to it, and we need to theorize about it.
Before getting into that, Wendt argues that the system does not create self-help idendities. An anarchic system is only a permissive cause of such an identity. He suggests one possible sufficient cause of self-help identities. If a predatory state emerged, it would force other states to respond. But even this depends on the prior identity; if the predatory state emerges into a system that already has a strong collective security identity, then it would be defeated without changing the dominant identity. So, think NATO. Realism would predict that, with the Soviet threat gone, the alliance will break up as states become suspicious of one another. But Wendt would seem to suggest that a collective identity can continue.
After making all this argument as background (and using up two-thirds of his pages), he then turns to the three independent variables that can effect a change in state identities and interests under anarchy.
X1: Sovereignty. Sovereignty is a norm, and it has been self-enforcing so far (look what happened to Hitler and Napoleon when they went against it). It has changed our interests, so that we think we need to defend territorial boundaries (even when letting a piece of territory go might be better for our security).
X2: Evolution of cooperation: Europe's long experience with cooperation during the cold war may have fundamentally changed its identity, creating a "European" identity that will persist despite the collapse of the Soviet threat and the renewed vigor of Germany.
X3: Intentional efforts to egoistic identities into collective identities: Gorbachev, recognizing that the USSR was losing the security battle, sought instead to proactively change its identity--and the identity of its adversary--into a cooperative identity. He did this by sending signals that he had changed (e.g. developing weapons that are only useful for defense) and by treating the West as the it, too, had changed.
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