Final answer:
Quakers, Union Soldiers, and abolitionists were key allies in the anti-slavery movement in the United States.
Explanation:
Quakers were significant allies in the anti-slavery movement, being among the first opponents of slavery in America. Leaders like John Woolman and Anthony Benezet advocated against slavery, emphasizing its incompatibility with Christian principles.
Union Soldiers also played a crucial role as anti-slavery allies during the Civil War, fighting to end the institution of slavery in the Confederate states.
Additionally, abolitionists such as William Lloyd Garrison, Frederick Douglass, and Sojourner Truth were vocal anti-slavery advocates, contributing to the growing momentum against slavery in the United States.
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