Between 1830 and 1842, the United States coastwise slave trade raised several issues and provoked numerous debates in Congress. The purpose of this study is to determine the role of the coastwise slave trade and its effect upon attitudes toward slavery in Congress during this period. The primary sources used include official government documents, unpublished and published papers, correspondence, diaries, speeches, and memoirs. This study concludes that the issues raised by the coastwise slave trade crisis and debated in Congress between 1830 and 1842 contributed to the decline of southern dominance in national politics and provided abolitionists with a vital motivation of antislavery agitation in the United States Congress.