https://history.answers.com/military-history/Which_slave_states_did_not_leave_the_union
Which slave states did not leave the union? - Answers
Delaware, Maryland, Kentucky and Missouri. The elected state leaders of Maryland would have left the Union, but the Federal government put them all in prison...
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https://www.geographicguide.com/united-states/historical-maps/map-1820.htm
US Map, Missouri Compromise, Free and Slave States - 1820
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https://law-journals-books.vlex.com/vid/policing-race-and-racing-873695274
Policing Race and Racing Police: The Origin of US Police in Slave Patrols. - vLex United States
Expert legal books and journals citations and scholarly analysis of Policing Race and Racing Police The Origin of US Police in Slave Patrols (Vol. 47 No. 3-4...
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