from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Nickname for any law which racially segregated public facilities and which was enacted in Southern and border states in the United States between 1876 and 1965.
From the song Jump Jim Crow (c. 1830) which mockingly portrayed African-Americans. The term Jim Crow became a generic term for African-Americans in the early- to mid- 19th century. (Wiktionary)