The broader philosophical context of the global justice debate, in both its contemporary and historical forms, is the issue of impartiality. Many people believe they have more important duties to family members, friends and compatriots than to strangers and foreigners. But are they right to endorse such partiality? Cosmopolitans, reportedly including the ancient Greek Diogenes of Sinope, have described themselves as citizens of the world. Thinkers including the utilitarian anarchist William Godwin have argued that everyone has an impartial duty to do the most good he or she can, without preference for any one human being over another. The broader political context of the debate is the longstanding conflict between more and less local institutions: tribes against states, villages against cities, local communities against empires, nation-states against the UN. The relative strength of the local versus the global has waxed and waned over recorded history.