It means "contrary to" or "opposing something". It can be used either as a prefix or as a single word. It is similar to the English word "counter".
Answer:
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True. It tells of his First Advent, as far as i remember, at least.
Missouri was admitted to the Union as a slave state in 1820 as part of the Missouri Compromise.
In an effort to maintain a balance between slave and free states in the Congress, they also admitted Maine as a free state at the same time.