Such constitutional states would also respect each other and would deal with each other in accordance with norms of mutual toleration. That argument was expanded by Jeremy Bentham- an eighteenth-century English phiiosopher-who couned the term 'internation law'. He believed that it was in the rational interests of constitutional states to adhere to internation law in their foreign policies. The argument was further expanded by lmmanuel Kant,an eighteenth-century German philosopher. He thought that a world of such constitutional and mutually respectful states-he calles them 'republics'-could eventually establish 'perpetual peace' in the world.