The township of roma is now inhabited by lusaka’s professional class. under the british, it was inhabited exclusively by privileged whites. in both cases, roma’s maids and gardeners come from the informal settlement to the northwest. this is an example of:

How segregation by class has replaced segregation by race.

Explanation:

In this example of Lusaka, we learn that the township of Roma was initially inhabited by the city's privileged white population. However, as the city's demographics changed, this area came to be inhabited by the new social group at the top of the hierarchy. This is the professional class of Lusaka. Whereas the township was segregated by race before, it is now segregated by class.