White flight
Later, Rochester saw the arrival of a great many black southerners as part of the Great Migration and large numbers of Hispanics (primarily from Puerto Rico. This coincided with White flight, leading to dramatic changes in the social, cultural and demographic makeup of Rochester (changes that were reflected in the city's politics). Racism, Segregation, Redlining and similar problems caused a great deal of racial tension and resentment, culminating in the 1964 Rochester race riot (as well as the city's black community playing a role in the national Civil rights movement).