It is effective because it changed history.
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Answer:
The obvious answer is B the other options would just be for quality (well not obvious but easy to figure out).
Northerners focused on the oppression of slaves while southerners defended their own right to self-government
that is your answer
hope this helps
:) plz mark brainliest if i helped
Answer: Mellow is the best word for it.
Explanation:
