Funan & Chenla	Khmer Empire

Post-Khmer	European Colonization

Historical Atlas of Southeast Asia

Source: National Geographic, 1973

I hope that everybody catches two egregious errors of labeling in these maps: (1) China in 500 a.d. is Six Kingdoms, not Sung Dynasty, and (2) China in 1200 a.d. is Sung Dynasty, not the Khanate.