Answer:
China had become communist in 1949 and communists were in control of North Vietnam. The USA was afraid that communism would spread to South Vietnam and then the rest of Asia. It decided to send money, supplies and military advisers to help the South Vietnamese Government. The U. S. failed to recognize that the Vietnam was a civil war, and most of the wars in which we engaged--most notably WWI and WWII--were wars based on one country's domination over another so that was what made it
different then other wars.
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A cupcake is an example of a primary reinforcer, whereas a certificate of achievement given to a student is an example of a secondary reinforcer. The primary reinforcers occur naturally and do not need to be learned. Primary reinforcers are biological. Food, drink, and pleasure are basic examples of primary reinforcers. Secondary reinforsers on the other hand are conditioned and require association with these innate reinforcers before they can produce a response.
D: Iraq, The other three choices are things that shouldn't affect you negatively but in Iraq there is constant conflict and violence.