Until the modern era there was no single international system, but rather several international systems, with little or no contact with another.

— Robert Gilpin War and Change in World Politics (1981)

More quotes by Robert Gilpin

The Political Economy of International Relations (1987)

The Political Economy of International Relations (1987)

The Political Economy of International Relations (1987)

The Political Economy of International Relations (1987)

The Political Economy of International Relations (1987)

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