““What changed at the end of the eighteenth century, therefore, was not so much the discovery of a fundamentally new concept in human relations but the emergence of a political movement universalizing what until then had been largely a local and territorial impulse. This insight helps to explain the speed of change. What is notable for our purposes is the dualistic or two-sided character of the free-air principle. On the one hand, it reflected views about what was proper in human relationships, a sense of the wrongness of enslavement. But on the other hand, it had an exclusivist side, a statement of pride in national identity, coupled with a determination to prevent established relationships from being disrupted by the””
