The United States July 1861 "invasion" of Virginia didn't happen until after Confederates had illegally seized dozens of Federal facilities -- forts, ships, arsenals, armories, mints, etc. -- threatened and fired on US officials (January through April, 1861), and threatened & launched a military assault on Federal troops in the Federal Fort Sumter (April 12, 1861).
Indeed, it didn't happen until after Confederates:
Pelham: "If not for the valiant defensive forces raised by Lincoln the United States above the Mason Dixon line..."
On April 12, 1861 the United States included six states South of the Mason Dixon line: Maryland, Virginia, North Carolina, Kentucky, Tennessee and Arkansas.
After Confederates assaulted Fort Sumter, four of those states declared secession, and Confederates soon sent forces to invade the others -- plus West Virginia which had declared its secession from the secessionists.
Missouri was North of the old Mason-Dixon, but that didn't stop Confederates from attempting to seize it from the Union by military force.
So, Confederate assault on Fort Sumter was the Confederacy's Pearl Harbor, and Bull Run / Manassas equivalent to some early WWII battle -- Kasserine Pass comes to mind.
Delaware is south of the Mason Dixon line.
Hunh. Is that like when the Rebels seized the Crown’s property and shot its Redcoats back in 1775?
WOW, I’m reading through the posts and you are quite the tool, I have yet to respond to you, but am being enlightened on your toolness. What elite propaganda machine university did you attend? Are you a communist by chance? Those that came over from Europe in the 1830’s were very influential in the North’s campaign. All fleeing the failure in Europe of the Engels influence. Thankfully Lincoln and Marx had time to correspond.
Talk to you soon!