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Mr. Ely’s amendment: Massachusetts Federalists and the politicization of slave representation

ABSTRACT Responding to state electoral losses in 1804, Massachusetts Federalists vehemently pursued an antislavery measure called the Ely amendment, which sought to end the three-fifths clause. Despite failure to pass the Ely amendment, opposition to the three-fifths compromise became central to Federalist politics through the Missouri crisis in 1820. Federalists participating in the Missouri debates chose to let Republican politicians lead the opposition to slavery’s expansion after putting forth their critique of the three-fifths clause. Yet Federalists’ repeated attempts to pass the Ely amendment ensured that a generation of Massachusetts citizens connected the three-fifths clause with southern domination.