Final answer:
The phrase relates to the Reconstruction Amendments as they provided federal protection for newly freed slaves, granting them freedom, citizenship, equal protection under the law, and voting rights for Black men.
Step-by-step explanation:
The phrase "the people whereof shall then be in rebellion against the United States, shall be then, thenceforward, and forever free" is related to the creation of the 13th, 14th, and 15th Amendments (The Reconstruction Amendments) of the United States Constitution because these amendments were enacted to protect the rights of newly freed slaves and to establish their status as free citizens with equal protection under the law.
The correct answer to the question would be: A. The Reconstruction Amendments established protection for the newly freed slaves from the federal government. This is because the 13th Amendment abolished slavery, the 14th