Can you point out exactly where the federal government’s power to use force to stop secession is enumerated in the constitution? I have not been able to find it myself. Thanks.
Look in Article 1; Section 8:
“To provide for calling forth the Militia to execute the Laws of the Union, suppress Insurrections and repel Invasions;”
Sure. Article I, Section 8: "Congress shall have the power to provide for calling forth the militia to execute the Laws of the Union, suppress Insurrections and repel Invasions..."