Answer:
The domino effect.
Explanation:
The Domino effect is the theory that when one country falls to communism then more will soon follow, one by one. This is what got us into the Cold War and all conflicts surrounding it, including the Korean and Vietnam War.
D.), because that allowed factory workers to work night shifts as well. It's not A.), because that happened during the first Industrial Revolution came about and trains became widespread. B.) doesn't make sense, because you really can only harvest in the daylight, and there's nowhere to put a light bulb. C.) is more of an effect of D.)
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Answer: . As the Athenian empire expanded and trade grew, Greek knowledge spread.
B. The Manhattan Project. and the location (Los Alamos NM) was referred to as the Manhattan engineering district
