Dalinar, be reasonable

PC load-bearing letter

Also his own brother in law, and a notorious slumlord

Because the Union won the war, and then failed to actually keep out the same assholes who wanted to secede in the first place.
In 1877, after 12 years of Reconstruction, the South pulled a bunch of BS including disputed slates of electors, trying to block certification of the election in Congress, and threatening to march on Washington (sound familiar?). They stopped holding the entire government hostage in exchange for ending Reconstruction.