Answer:
expanding sea trade.
Step-by-step explanation:
- The southeastern Asia is a subregion consisting of the geographically south china, east of the Indian subcontinent and the northwest of the Australian and has an area of 4,545,792 km square with a population of 655,298,044 and is 10.5% of the Asia and 3% of the Asian landmass. and forms the member of the ASEAN a regional organization that establishes the economic, the political, military, the educational and the cultural integration.
- Especially of the Vietnam in the northern parts and was under the dominance of the chines and this became a trading hub for the west and northwest and the silk route also has flourished due to there existence.