The North gave up to the South over a dozen of installations except for Ft. Pickens and Ft. Sumter. Why?
Most of what the south seized were unmanned. The exception was Texas, where the commanding general there ordered the troops to turn over facilities without approval of Washington. General Twiggs later became a confederate general, surprise, surprise. Sumter and Pickens had commanders who did their duty.
What did Lincoln promise the South about Ft. Sumter?
I give up. What did Lincoln promise the South about Fort Sumter?
How many Yankees were killed at Sumter and how? Did the firing upon Ft. Sumter really deserve a response to invade the entire South and begin a War that was responsible for the deaths of over a half million Americans?
Had the Japanese managed to bomb Pearl Harbor and sink all those ships yet not kill anyone would it have been any less a declaration of hostilities? The South bombarded Sumter for more than 24 hours, and had they killed every man in the process their actions would have been no more hostile than not killing anyone. The fact that nobody died is more a tribute to the fort and the poor marksmanship of the rebel artillery than any sense of altruism on the part of the Davis regime.
Why did Lincoln fire David Hunter and John C. Fremont early in the war?
It boiled down to refusal to obey the existing civil laws.
I'm not familiar with NC, but Tennessee seceded because Gov. Isham Harris and his slavery-loving gang in the state legislature ignored the expressed will of the people (almost 2 to 1 against even calling a secession convention) and invited the reb army in anyway. The subsequent rubber stamp election was widely regarded as a sham.