| 词汇 | Mason-Dixon Line |
| 词根词缀 | 词源： 1779, named for Charles Mason and Jeremiah Dixon, Eng. astronomers who surveyed (1763-7) the disputed boundary between the colonial holdings of the Penns and the Calverts. It became the technical boundary between "free" and "slave" states after 1804, when the last Northern state (New Jersey) passed its abolition act. As the line between "the North" and "the South" in U.S. culture, it is attested from 1834. |
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