The idea that peaceful mind could solve all problems in life helped spread Buddhism. It was especially popular in Eastern Asia because there were no dominant regions at the time and it originated in Asia.
The answer is the North Vietnamese took over the South Vietnam spreading communism Southward and this proved the domino theory (if one country come under the influence of communism, the surrounding countries would follow).
Answer:
Small flour and lumber mills flourished. There were important rope-making plants in Kentucky. Many Southern cities had commercial cotton presses. Iron and coal were mined in Virginia, Kentucky, and Tennessee.