Hey there!
Their goal was to fight and Vietnam and win, as in any other war for the US. This was because of something very important called the Domino Effect, created by Dwight D Eisenhower, which stated that if one country adopted communism, other countries surrounding it and eventually the world would start too.
The US couldn't have communism spread. That's why we were enemies with the Soviets and created a trade embargo on Cuba in 1960. Our goal was to get rid of communism once and for all.
However, on March 29th, 1973, when President Nixon withdrew all remaining troops from Vietnam, leaving America's first defeat, the Domino Effect could have happened and been quite bad. However, it did not spread around Indo-China, and few countries use communism today.
Hope this helps!
The geographic feature that most directly influenced the development of Greek city-states was 2. its mountainous terrain. Greece is a series of island separated by sea and marked with numerous mountains. These mountains kept the region from ever becoming completely unified in ancient times because of the difficulty it took to get from point A to point B. Instead, these mountains resulted in the formation of city-states, smaller political units centered around a single city but sharing a culture similar to other city-states in the area. They were connected by culture rather than politics.
The accomplishment that is not mentioned on Jefferson's tombstone is that he was the third president of the United States of America.