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Carr's theory was proven when World War II broke out the day after his book was published. (Burchill 2001 p. 71).
Morgenthau's work, Politics Amongst Nations (1948) sought to apply a positivist methodology used in the natural sciences to international relations. Thus we can draw objective knowledge and laws from the social world in the same way that we can from the natural world. (Burchill 2001 p. 77). He maintains that politics is governed by objective laws rooted in human nature and that human nature is reflected in the way states behave. The outcomes of the interaction of states are due to the behaviour of statesmen and thus human nature. (Burchill 2001 p. 83). Morgenthau and Carr draw on a long philosophical heritage going back to the writings of Thucydides 460BC to 406BC and Niccolo Machiavelli 1469 to 1527.
The neo-realist perspective came about in response to the rise of liberal internationalism and their interdependency theory in the 1970s. Neo-realism engages with this approach that deems the state to be less significant in an interdependent world due to the rise of institutions, regimes and transnational corporations. (Baylis & Smith 2005 171). Realism recognised that it had to develop new tools to analyse these new developments. Thus realism reinvented itself as neo-realism, acknowledging that such non-governmental actors exist, but they have to work within an anarchical international system where there is no overall authority above that of the sovereign state. This means states can never fully co-operate within these institutions due to the possibility that one state may gain more out of this co-operation. The anarchic structure of the system is where neo-realism departs from the earlier realist theory that human nature determines how states behave. Waltz' systemic approach is that it is the structure of the international system that determines the way states behave and not human nature. Despite this departure it can be said that there are core theoretical elements that underpin the earlier classical realism, modern realism of Carr and Morgenthau and Waltz's structural realism. This is known as the realist triangle of state, survival and self-help. (Baylis & Smith 2005 p. 163).
The primary actor in the international system is the state. This can be traced back to Thucydides' time when the unit of analysis was the city-state or polis. (Baylis & Smith 2005 p. 163). That said, Carr and Morgenthau were less state-centric in that they did not envisage the state as the final form of political community. (Burchill 2001 p. 76). The state is the only legitimate representative of the people and it uses this legitimacy to wield its authority within and outside the state. (Baylis & Smith 2005 p. 163). The second core element is that of survival.