Let me go look it up real quick brb
People during this time period generally used Africans as slaves because they were easy to capture and use for cheap labor. Settlers wouldn't have to paid people for the labor so their profits increased.
The spread of Buddhism can be attributed to many things. There are two main ones that stand out amongst the rest. The first being the support of the general population, many people supported Buddha and so it spread easily. The other being the royal patronage.
Answer:
The secret war in Laos played out as though it were a wonderful piece of ... one of the most important installations in Laos during the war.