Final answer:
During Reconstruction, the federal government enacted the Enforcement Acts to protect African Americans' civil rights and suppress Klan violence, but white supremacist violence continued and ultimately contributed to the end of Reconstruction, leading to Jim Crow laws and the disenfranchisement of black voters.
Step-by-step explanation:
The federal response to white supremacy groups and race-related violence during Reconstruction included efforts to integrate African Americans into Southern society, encouraging them to participate in politics and hold public office. Despite attempts to enforce civil rights, federal authorities were often ineffective at protecting African Americans from white supremacists. The Enforcement Acts were passed to criminalize the deprivation of civil rights and address violent Klan behavior. Nevertheless, these measures did not completely stop the violence. Post-Reconstruction, the resurgence of white supremacy saw the establishment of Jim Crow laws and the disenfranchisement of black voters, cementing a legacy of racial repression.