The answer is D. All of the above, as different changes in the environment can lead to many different things.
The Underground Railroad is not a railroad that is underground, instead, it is referring to a secret passage for slave escaping in safe houses. The conductor of the Underground Railroad could be the person who helps the slave escape, the lines could refer to the road or the passage which the slaves escaped from one safe house to another, the station could refer to the stops they make in the safe houses, and the freight may refer to the slaves that are escaping.
Answer:
Europeans explored and claimed that more and more land was there. They had to make relations with people who were already in the Americas and try to find a way to conquer them and claim that land theirs.
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