Final answer:
Former Unionists, non-slaveholding white farmers, and southern upcountry residents were the Southern white Republicans who supported Reconstruction governments.
Step-by-step explanation:
The Southern white Republicans who supported Reconstruction governments included former Unionists, non-slaveholding white farmers, and southern upcountry residents. These groups were diverse and had different motivations, but they all supported the Republican ideals of creating a postwar South that would not be under the control of the old Confederates. While they may not have embraced full equality for blacks, they certainly supported the Republican cause of improving conditions for them.