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Definition the Mason-Dixon Line in American English

the Mason-Dixon Line

/ˌmeɪs(ə)n ˈdɪksən ˌlaɪn/
1

the border between the two states of Maryland and Pennsylvania in the U.S. that traditionally divides the north of the U.S. from the south. In the past, this was the border between those southern states that supported slavery and the northern ones that did not.

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Definition the Mason-Dixon Line in American English