What role did Abraham Lincoln play in the Mexican-American War?

B. As a Congressman, he opposed it.

Explanation:

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Digital History. Annotation: Elected as a Whig to Congress in 1846, Abraham Lincoln gained notoriety when he lashed out against the Mexican War, calling it immoral, proslavery, and a threat to the nation's republican values.

Early on in Lincoln's political career, as a freshman Whig congressman from Illinois, he condemned the 1846 U.S. invasion of Mexico, bucking the prevailing patriotic tide and accusing President James K. Polk of promoting a falsehood to justify war.

Explanation:

When the war began, it was my opinion that all those who, because of knowing too little, or because of knowing too much, could not conscientiously approve the conduct of the President, in the beginning of it, should, nevertheless, as good citizens and patriots, remain silent on that point

In short the answer is B

regarding the law, the 15th amendment was specifically designed thinking in the rights of black free men.

even though ratified on february 3, 1870, the promise of the 15th amendment would not be fully applied for a long time.poll taxes and literacy tests would allow southern states disenfranchise african americans. only in 1965 the voting rights for african americans would be actually able to vote in the south.

in 1965, president johnson signed the voting rights act, which aimed to overcome legal barriers that prevented african americans from voting as it was guaranteed by the 15th amendment to the u.s. constitution.