Answer:
Some people believe it was man-made but there is no proof if it was or was not (i think it is man-made). It could be because the world is getting over-populated so this could be a way to wipe some people out.
Well What Were The Following Effects?
Answer:
Tubman herself used the Underground Railroad to escape slavery. In September 1849, fearful that her owner was trying to sell her, Tubman and two of her brothers briefly escaped, though they didn't make it far. For reasons still unknown, her brothers decided to turn back, forcing Tubman to return with them.
Explanation:
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