Which of the following best describes the “domino theory,” which was used as a justification for us involvement in vietnam?

The Answer is D)  If a country falls to Communism, then its neighbors are also likely to do so.

the difference is that white collar worker performs skills like worker as a scientist or well blue collars do physical work and they do services like being a cook.

2686-2181 bce-- "egyptian civilization developed along the nile river in large part because the river’s annual flooding ensured reliable, rich soil for growing crops."

1069-664 bce-- "ancient egyptians developed wide-reaching trade networks along the nile, in the red sea, and in the near east."