The correct answer is D. They mapped trails and helped build forts
Explanation
Mountain men are a group of people who lived in the western mountains of the United States. These mountains were characterized by being difficult to access, so there were no roads in this area, and it did not have many human settlements. Once the idea of building and connecting the entire country was planted, the help of men who inhabited this area was needed to trace the roads and build them because they knew how to move and work on that terrain due to their extensive experience in that terrain. Therefore, the correct answer is D. They mapped trails and helped build forts
Enforcing Immigration Laws
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Answer: The answer is C: There were massive increases in production due to the use of crops better suited to advance agriculture.
Explanation:
"Green revolution" is a term used for rapid increases in crops especially 'wheat' and 'rice' yields in developing countries which was introduced to Mexico and India by Norman Borlaug and Ms Swaminathan in the early 20th Century. They used improved crop varieties combined with the expanded use of fertilizers and other chemicals to boost crop production in developing countries. The goal of the Green Revolution was to increase the yields of wheat and rice by improving agronomic technology. This helped developing countries to overcome food defects.