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The expansion of Vietnam throughout most of its history could be described as "Champa-screw" (with a little bit of Cambodia-screw for the Mekong Delta) as the former expanded its territory southward through conflicts and/or treaties with its (former) Indianized Austronesian neighbor.

I was really thinking recently of an alternate Vietnam that expanded westward to the east bank of the Mekong River instead of expanding south; what POD should be needed to realized it?

What would be the possible impact on the following:
1. Tai migration to present-day Thai territory, especially in the Isan region.
2. The settlement of the northern tip of Sumatra.
3. The effects of a surviving Champa on the history of (continental) Southeast Asia.
4. Impact on the other Austroasiatic groups living in OTL Laos.

Share your thoughts, guys.
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