Answer:
The underlying factor here is that the North had agreed to not interfere with the way the southern states handle their black population in the compromise of 1876.
Explanation:
The compromise of 1876 was an undocumented agreement, that was used to settle the disputes that followed the 1876 presidential election, within the United States congress. After the compromise, President Rutherford B. Hayes was declared president, over Democrat Samuel J. Tilden, but an agreement was reached that president Rutherford Hayes would ensure the withdrawal of federal troops from former confederate states of the south. Other parts of the agreement was that David M. Key of be appointed as Postmaster General, and the non interference of the north with how the southern states handle their black populations. Some other agreements like he construction of another transcontinental railroad in the south, and the industrial reconstruction of the south were not acted upon.
The North called it quit and left the freed people to an unhappy Jim Crow fate because, part of the agreement reached in the 1876 compromise was that the North wold not interfere with the way the southern states handles their black freed people population. Also, the North was not really affected anyways, and although a few people in the North denounced these laws, nothing much was done about it.
