Answer:
4. J
5. C
6. F
7. G
Sorry if any of these are wrong
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The Qin Dynasty protected against invasion by "<span>d. building a great wall along the border" although it should be noted that strong additions to the military were made as well. </span>
The main reason why the United States sent economic aid and military advisers to South Vietnam was because they wanted the South Vietnam to win their fight over the North Vietnamese, who were communist. We also wanted to limit the number of American troops we sent into the conflict.
