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Wikipedia definition
1. Border states (American Civil War)In the context of the American Civil War, the border states were slave states that did not declare their secession from the United States before April 1861. Four slave states never declared a secession: Delaware, Kentucky, Maryland, and Missouri, and four others did not declare secession until after the 1861 Battle of Fort Sumter: Arkansas, North Carolina, Tennessee, and Virginia—after which, they were less frequently called "border states".
Read “Border states (American Civil War)” on English Wikipedia
Read “境界州” on Japanese Wikipedia
Read “Border states (American Civil War)” on DBpedia

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