One of the most liberal cities in the country voted Tuesday to officially apologize to the city’s black residents for purported historical injustices. The San Francisco Board of Supervisors unanimously approved a resolution apologizing “to African Americans and their descendants for systemic and structural discrimination, targeted acts of violence and atrocities,” according to city records. The resolution cited the legacy of slavery, historical discrimination, disproportionate homelessness among African Americans and allegedly racist policies pursued by the city as among the reasons for the bo…