Which group was most outspoken in its opposition to the Mexican-American War?

Name: Which group was most outspoken in its opposition to the Mexican-American War?
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The Whigs were the most outspoken in their opposition to the Mexican-American War. Many Whigs saw the war as an unjust invasion of a weaker neighbor and feared it would lead to the expansion of slavery into newly acquired territories. Some prominent Whigs, such as Abraham Lincoln, spoke out against the war in Congress.

Which Group Was Most Outspoken in Its Opposition to the Mexican-American