There cannot be two governments exercising the same authority in the same area; when the military governments were established by the Reconstruction Acts in the ten Southern states from 1865 to 1877, no other government had sovereignty in those states; thus no legislation could be enacted except under the umbrella of martial law; therefore, when martial law ended, all legislation enacted under martial law was void.
What was passed and not constitutionally legal today?
There are two inescapable conclusions to be drawn from this record-first, that the Thirteenth, Fourteenth, and Fifteenth Amendments, which drastically changed qualifications for citizenship in the United States, voting rights, and other fundamental matters, were ratified while the ten Southern states were under martial law, and their rightful governments had been superseded by military force; and two, that legislation passed during periods of martial law effectively ends or is automatically repealed when martial law ends and the troops are withdrawn. The Reconstruction governments, which, as Collier's notes, could only be sustained by force, ended when that force was withdrawn. Thus these amendments to the Constitution have had no legal status since 1877, when President Hayes withdrew the federal troops from the Southern states. These amendments are and have been invalid since 1877.