To categorize the quotes from the passage regarding the justification of the Mexican-American War, we can consider the sentiments expressed about Polk's actions and the war itself.
Justified:
- None of the quotes in the provided passage support the idea that the war was justified. Polk's initial attempts to purchase the land and his declaration to Congress can be contested by the context of the war's initiation.
Not Justified:
- "Many Northerners believed that Polk, a Southerner, was trying to gain land for the slaveholding South."
- "Other Americans simply thought it was wrong to use war to take land from Mexico."
- "Ulysses S. Grant…would later call the war 'one of the most unjust ever waged by a stronger against a weaker nation.'"
All the quotes presented in the passage suggest that the war was not justified, reflecting concerns about moral implications, intentions behind the war, and the unequal power dynamics involved.