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That would be the weather; the harsh winters were brutal.
And what the weather didn't do, the many diseases certainly did.
No, it wasn't so much the native Americans -- like you were probably thinking.
Most commonly "C", because they would want the reader to understand that something is different. Yes, they can change the style whenever they want to, but it would be more meaningful if they did it for a reason.
Answer:
The waves symbolize the Seventh's Man's fear.