Sundown towns, also known as sunset towns, gray towns, or sundowner towns, are all-white municipalities or neighborhoods in the United States that practice a form of racial segregation by excluding non-whites via some combination of discriminatory local laws, intimidation or violence.
The Green Book, in full The Negro Motorist Green Book, The Negro Travelers’ Green Book, or The Travelers’ Green Book, travel guide published (1936–67) during the segregation era in the United States that identified businesses that would accept African American customers. Compiled by Victor Hugo Green (1892–1960), a Black postman who lived in the Harlem section of New York City, the Green Book listed a variety of businesses—from restaurants and hotels to beauty salons and drugstores—that were necessary to make travel comfortable and safe for African Americans in the period before passage of Civil Rights Act of 1964.