Beginning in 1975, largely parallel with the coffee crisis in East Germany, the production of Robusta coffee began in Vietnam. Robusta plants grow faster, contain more caffeine, suit the climate of the Vietnamese Central Highlands, and lend themselves better to mechanized harvesting.
My in-laws were part of the generation of displaced Vietnamese who were resettled in the Central Highlands for coffee cultivation back in the 70s-90s, but this mass migration of ethnic Vietnamese pissed off the indigenous Jarai and other Hmong+Khmer ethnic groups, which led to a sustained insurgency and a lot of horrid human rights abuses.
The current GenSec of Vietnam (To Lam) is notable for his career as the butcher of Gia Lai during his tenure there as part of the MPS.
I think the insurgency is largely dead, but the Central Highlands remains very poor and smuggling+corruption are sustained issues.