Answer:
The major cause of Reconstruction was the compromise that the Democrats and the Republicans came to which stated if Hayes will be elected, that he has to withdraw federal troops from the South.
An evidence from the text supports that:
The compromise stated that if Hayes were elected, he would withdraw federal troops from the South, effectively ending Reconstruction.
Step-by-step explanation:
From the excerpt, we discover that the election of 1876 was to the favour of Hayes, the Republican nominee but the Democrats resisted and rejected the outcome of the election. This then led to the compromise that required the end of Reconstruction. The Democrats gave the election win to Hayes as they all agreed to the compromise. This they did because they wanted power to return to the South.