Question: Edwin Forrest's feud with William Charles Macready was the cause of what event that occurred on May 10, 1849, in Manhattan?
Sentence (from "Astor Place Riot"): It was the deadliest to that date of a number of civic disturbances in New York City which generally pitted immigrants and nativists against each other, or together against the upper classes who controlled the city's police and the state militia.
Relevant evidence: No