This is true that Northern politicians opposed the terms of the Missouri Compromise because they allowed slavery to spread into the lands acquired through the Louisiana Purchase.
The Missouri Compromise was a combined regulation of the United States that equalized the desires of northerly states for fear that the growth of bondage in the country accompanying those pertaining to the southern states to extend it. This act acknowledged Missouri Compromise as a slave state and Maine as a non-slave state as long as, so as not to upset the balance 'tween slave and free states in the country with its own government.
The Louisiana Purchase was the purchase of the domain of Louisiana apiece United States from the French First Republic in 1803. In return for fifteen heap currency or nearly eighteen currency per square 5, the United States nominally collected a total of 828,000 sq mi in Middle America.
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