Task: Question Generation
Input (English): The portion of the city south of the James River is known as the Southside. Neighborhoods in the city's Southside area range from affluent and middle class suburban neighborhoods Westover Hills, Forest Hill, Southampton, Stratford Hills, Oxford, Huguenot Hills, Hobby Hill, and Woodland Heights to the impoverished Manchester and Blackwell areas, the Hillside Court housing projects, and the ailing Jefferson Davis Highway commercial corridor. Other Southside neighborhoods include Fawnbrook, Broad Rock, Cherry Gardens, Cullenwood, and Beaufont Hills. Much of Southside developed a suburban character as part of Chesterfield County before being annexed by Richmond, most notably in 1970.
Output (English): Prior to joining Richmond, what county was a significant portion of Southside part of?