21st-century segregation exists overtly in [American] school systems, communities, and prisons. It also permeates our society in ways we don't even realize. We need to continue the conversation about the shocking segregation in our schools and neighborhoods. According to a study last year, 43% of Latinos and 38% of blacks go to schools where less than 10% of their peers are white. But beyond that, we often fail to talk about how segregation impacts us personally. How it permeates not only many of our public and private institutions, but American culture at large. We less easily talk about cultural or social segregation, an area that we have control over, via the restaurants we patronize, the bars we drink at and the places where we worship. 
Racial segregation used to happen officially and was sometimes legally enforced. Below are examples.