Final answer:
Both the PRO and CON sides presented equally developed arguments with compelling evidence in the article.
Step-by-step explanation:
In the article, both the PRO and CON sides presented equally developed arguments with compelling evidence. The article discussed the arguments over the expansion of slavery made by both northerners and southerners after the U.S. victory over Mexico. Each side had significant arguments, and it is subjective to determine which side had a more compelling case. The article did not provide a clear viewpoint or evidence to favor one side over the other.