Final answer:
William Lloyd Garrison used the Declaration of Independence to justify his call for the abolition of slavery, aligning his mission with its principle that all men are created equal.
Step-by-step explanation:
Garrison used the Declaration of Independence as his justification for demanding the abolition of slaves. William Lloyd Garrison was a prominent abolitionist who published the newspaper The Liberator and was known for his strong opposition to slavery. He believed in the concept of immediatism, the immediate end to slavery without any gradual process or compromise. He staunchly opposed the U.S. Constitution, calling it "a covenant with death and an agreement with Hell," because he saw it as a document perpetuating slavery. However, he aligned his mission for immediate emancipation with the principles outlined in the Declaration of Independence, especially the notion that all men are created equal and have certain unalienable rights.