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In page Thomas Wentworth Higginson:

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He then studied theology at the Harvard Divinity School. At the end of his first year of divinity training, he withdrew from the school to turn his attention to the abolitionist cause. He spent the subsequent year studying and, following the lead of Transcendentalist Unitarian minister Theodore Parker, fighting against the expected war with Mexico. Believing that war was only an excuse to expand slavery and the slave power, Higginson wrote anti-war poems and went door-to-door to get signatures for anti-war petitions. With the split of the anti-slavery movement in the 1840s, Higginson subscribed to the Disunion Abolitionists, who believed that as long as slave states remained a part of the union, Constitutional support for slavery could never be amended.