These <span>ups and downs in an economy are often referred to as</span> "business cycles". These cycles are to be expected and don't cause great alarm for economists or investors.
The United States feared that if communism was successful on Vietnam, the rest of the countries that border it would soon turn into communism and those other countries that border that new communist country would also be converted to communism and so on. This is called the "domino theory" and made the United States to send troops to prevent the theory from happening.
Hard work was required to make progress
