When federal troops were attacked in Baltimore on April 19, 1861 it could be considered an act of insurrection. Mayor Brown wrote President Lincoln and threatened:
It is my solemn duty to inform you that it is not possible for more soldiers to pass through Baltimore unless they fight their way at every step. I therefore hope and trust and most earnestly request that no more troops be permitted or ordered by the Government to pass through the city. If they should attempt it, the responsibility for the bloodshed will not rest upon me".
Lincoln's reply to Mayor Brown and a Maryland delegation:
“You, gentlemen, come here to me and ask for peace on any terms, and yet have no word of condemnation for those who are making war on us. You express great horror of bloodshed, and yet would not lay a straw in the way of those who are organizing in Virginia and elsewhere to capture this city. The rebels attack Fort Sumter, and your citizens attack troops sent to the defense of the Government, and the lives and property in Washington, and yet you would have me break my oath and surrender the Government without a blow. There is no Washington in that — no Jackson in that — no manhood nor honor in that. I have no desire to invade the South; but I must have troops to defend this Capital. Geographically it lies surrounded by the soil of Maryland; and mathematically the necessity exists that they should come over her territory. Our men are not moles, and can’t dig under the earth; they are not birds, and can’t fly through the air. There is no way but to march across, and that they must do. But in doing this there is no need of collision. Keep your rowdies in Baltimore, and there will be no bloodshed. Go home and tell your people that if they will not attack us, we will not attack them; but if they do attack us, we will return it, and that severely.”
The actions of southern sympathizing Maryland residents directly threatened the United State capitol. I would call that a state of rebellion.
One thing about Lincoln, the man was a F***ing genius with pen and paper. That is another beautiful piece of writing by him. Clear. Succinct. Profound, and to the point. Of course, the Confederates had no intention of attacking Washington, but Lincoln cannot be faulted for being prudent.
The actions of southern sympathizing Maryland residents directly threatened the United State capitol. I would call that a state of rebellion.
I think it is as close enough as to make no difference. I think you've proved your point. But I will point out that later Lincoln suspended Habeas Corpus for the entire Union. Were all the remaining Union states in Rebellion too?