How did China’s maritime frontier resemble its other frontiers? How did it differ?

Please read these first. The work has to rely on those readings.Readings:Ropp, Chapter 5 (“Diminished Empire and Nomadic Challengers”)Schottenhammer, “China’s Gate to the Indian Ocean”Clark, “Frontier Discourse and China’s Maritime Frontier”Chaffee, “Diasporic Identities”