Why had northern support for reconstruction faded by the end of the 1860s? ?

There were several reasons that Northern support had faded:

The cost of military operations in the south worried many people

The south didn't want to change and were passing laws in direct repudiation of federal mandates

The KKK terrorists were widely accepted in some southern state governments

Violence against blacks and dismissal of law was widespread... reconstruction didn't seem to be working. I hope this helps

. political or economical policy that isolates a country from participating in international relationships. it has been suggested that the united states participates in isolationism because of its lack of involvement in particular wars or alliances.

hi how are you doing today? if you ever need just tell me