ion remaining was whether, since a county is an integer or part of a State, the United States can impose upon it, as such, any obligations to keep the peace in obedience to United States laws.27 This he answered affirmatively, citing Board of Comm'rs v. Aspinwall, 24 How. 376, 16 L.Ed. 735 (1861), the first of many cases28 upholding the power of federal courts to e force the Contract Clause agai