Because they are important to the American people and symbolize America in a whole
Answer:
The most important change in the US economy after the Civil War was the transformation from an agricultural society into an industrial society. Factors to be taken into account are: a large pool of labor thanks to constant immigration from abroad; access to massive amounts of raw materials such as timber, iron ore, oil; new inventions and technological advances; and the transcontinental rairoad that connected the East and the West coasts, facilitated the movement of items and people throughout the American terrritory. Growing urbanization and better living standards in cities are a result of industrialization.
Explanation:
B) Preventing the spread of communism
The role of the united state in Vietnam war began after the world warII. US mission was to restrict the communist domination that was present in Vietnam government, this was because communism could easily spread to the Neighbouring countries which would result to a change in the balance of power throughout Southeast Asia.