Your people were fucking degenerates who got off on raping their slaves (frequently committing the almost equally Christian act of adultary at the same time). How messed up is that, Wabbit?
Fort Sumter was sovereign US soil. You cannot claim ownership of it, because it is not yours. You can bargain for it, and offer to make some sort of payment, but America is not obligated to sell off it's possessions, merely because they are surrounded by your own. The fact that Lincoln assumed you would be stupid enough to attack it, and thus postured the fleet in a ready state does not change the fact that he gave the option for war to you, and you took it.
Fort Sumter, 1861; Pearl Harbour, 1941. Sometimes our enemies just overreach, and give us the moral high-ground to begin a protracted war by attacking our military installations.