Because so many people thought of black people(African Americans) as of being just slaves still and thought that we should not be treated like everyone else such as White people should get treated. Some White people lived in urban areas and fidnt like that African Americans should live in that area or even stable homes. White people already thought that African Americans shouldnt have any rights.
Hope this helps
The tension between POC and white people was because humans are naturally wary of things that are different, or out of the norm, this goes for racial issues, lgbt issues, religious issues, and many people fear certain medicine and food because it’s “unnatural”.
Vietnam was divided by the 1954 Geneva Agreement that followed the French defeat at Dien Bien Phu. The last Americans were withdrawn from the South on April 30, 1975, following the Communist victory over the Saigon forces supported by the United States.