What was cause of golden triangle?

The Golden Triangle, a region in Southeast Asia where the borders of Thailand, Laos, and Myanmar meet, became notorious for opium production. Its emergence as a major opium-producing area in the 20th century was driven by a combination of factors, including the geographical suitability for poppy cultivation, the presence of ethnic groups engaged in opium farming, and political instability in the region which allowed drug trafficking to flourish. Efforts by governments and international organizations to combat drug production have led to varying degrees of success, but the area's historical significance in the global drug trade remains.