Essay from the year 2021 in the subject Politics - International Politics - Topic: Miscellaneous, grade: 1,0, , course: Course: Contemporary Geopolitical Issues, Summer Semester 2021, language: English, abstract: Historically speaking, before the emergence of national states in Europe, the dominant actors of foreign policy have been already cities. But latest after the Westphalian Peace in 1648 nations and their representatives became - till today - the main and super dominant actors in diplomacy and foreign cooperation. Today, the whole post WW2 international public law bases most of on contracts between states. But is that still contemporary and sustainable?Various arguments can be instead highlighted for the need and emergence of influence for city diplomacy. On the one hand, since 21st century more than half of the world population is living in cities, prognoses show even higher shares for the next 30 years. Megacities like London, Tokyo or Istanbul are more inhabited that small and medium size nations.