The New York race riots of 1919 developed with increasing racial tension and violent incidents in New York City. These riots were a part of the Red Summer, a series of violent terrorist attacks on black communities in many cities in the United States during the summer and early autumn of 1919. The New York race riots were caused by social tensions such as competition for jobs, politics, and racial tension. Many historians and scholars view these riots as the culmination of racial tensions which had been rising due to the migration of African Americans from the rural South to northern cities. Tensions developed partly due to the competition for jobs, which was worsened by the presence of African Americans workers who could replace striking White workers.