you make your point by secession....you can then send a message to Washington that you would need to have a discussion about the inevitability of moving your forts out of the sovereign nation of the CSA...
The Confederates did exactly that, sending three commissioners to D.C. to discuss the matter with the Lincoln administration. They were assured by the U.S. Secretary of State, William Seward, that Ft. Sumter would be evacuated, and that the administration had no plans to resupply it. The Confederates assumed that the Sec. of State spoke for Lincoln, but that was obviously not the case.