Ethnic cleansing of North America, Slave codes, yellow peril, Japanese internment, red scare, islamophobia, red scare 2.0 (ongoing), yellow peril 2.0 (ongoing)

Ethnic cleansing of North America, Slave codes, yellow peril, Japanese internment, red scare, islamophobia, red scare 2.0 (ongoing), yellow peril 2.0 (ongoing) And that's just USA. What is "historically" supposed to mean here?