Which two of these goals belonged to the enforcement acts of 1870 and 1871?

to protect voters from threats during elections

to protect the rights of white southerners to prosecute members of the ku klux klan

to prosecute republicans who threatened african americans

to protect democrats who threatened african americans

Of the three Enforcement Acts, the Enforcement Act of 1870 was the first that was passed by the United States Congress from 1870 to 1871 during the Reconstruction Era to counter attacks on the suffrage rights of African Americans from  the violent groups like the Ku Klux Klan.

The Enforcement Act of 1870 forbids discrimination by state officials in voter registration based on race, color, or previous condition of servitude. Penalties are established for preventing a person's right to vote and grant the federal courts the power to enforce the act. 

Thus, the answer to this item is definitely the first and the second option:

even if someone does vote because of your twitter status, there is no civic duty and would have been a more responsible citizen by not voting at all. voting should therefore not be viewed as a fulfillment of civic duty.

hope this : )