Well, this is surely not in the US. But the Garo, Khasi, and Jaintia Hills are all located in parts of Assam, India, and Meghalaya, India.
We can not say that this areas are not civilized or to call them backwards. We may call them different. We can take for example the uses of animals in order to expand the commerce of their area. If we research about the use of camels, for example, we could see that it gained an special place within those who wanted to travel through many difficult areas like deserts. So in the case of camels they were not backwards, they used a different method to obtain success
As a way to ensure that deaf and blind individuals would be able to live and work in the community of their choice
The answer is petroleum
hope this helps!
