What would be the result if Cambodia, Champa and Vietnam got merged as a single country?
What would be the result if Cambodia, Champa and Vietnam got merged as a single country?
It depends totally on the time period. In the medieval or Renaissance era, a united peninsula could potentally resist Chinese occupation, while they were united in the 1880's as French Indochina.
So, please specify on the time period.
Actually, I'd say your best bet is faster Viet expansion (IDK enough to know hoe you achieve this). The Viets basically practiced ethnic cleansing and settler colonization, as against Champa; the biggest reason Cambodia was so pro-French was because without French intervention, they were next in line.
So a larger Viet state, in time, will just be a larger ethnic Vietnam.