Answer:
The correct answer is: "expanding and protecting African Americans' civil rights"
The attitude and aims of the US Congress during the Reconstruction era, are evidenced by the amendments to the US Constitution that were enacted after the Civil War.
For example, the 14th and 15th amendment were issued in that moment, to guarantee equality of rights for all US citizens, without discrimination in terms of race, color or previous condition of servitude.
Step-by-step explanation: