Republican (nationalist) de facto President Rutherford B. Hayes (a resident of the federal enclave of Ohio) signs the Posse Comitatus Act of 1878, prohibiting the Army of the United states from enforcing civilian law.
[added 3/29/2025]
Subsequent Events:
Authority:
Article I, Section 8 [Clause 14]
ccc-2point0.com/constitution-for-the-united-states
References:
Posse Comitatus Act – Wikipedia
en.wikipedia.org/wiki/Posse_Comitatus_Act
Reconstruction era – Wikipedia
en.wikipedia.org/wiki/Reconstruction_era