The best and most correct answer among the choices provided by your question is the second choice which is "railroad tracks."
<span>By 1860 the Midwest and the East were united by a network of railroad tracks.</span>
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There were more jobs in the cities, if everyone worked on a farm there wuld be more than billions of grocery stores, then they would be wasting food because not everyone would buy evrything!
The dangerous period of rivalry between the United States and the Soviet Union was called the "Cold War" <span />
Agriculture plays a crucial role in the rise and development of civilizations, since it allows for there to be a "food surplus"--meaning that people other than farmers can spend time and effort developing new skills and practicing new trades.
Answer:
The challenges that New France faced in North America was oppressive aristocracy and church dominated feudal system.
