You have it upside down - again. It was the south who took the “my way or the highway” tone. It was the south who ratched up the hostilities. It was the south who built up the fortifications - when they weren’t stealing them outright.
The SOUTH was enforcing their positions.
“The SOUTH was enforcing their positions.”
The North held forts in the South. I don’t see any forts of the South in the North. You make no sense.