No, my point is valid regardless.
But in fact, by April 15 Confederate forces were already active in at least seven non-Confederate states -- seizing Federal properties (i.e., forts, ships, arsenals, mints, etc.), threatening Federal officials and anyone else loyal to the Union.
Those seven Union states included not only Maryland and Missouri, but also Virginia, North Carolina, Tennessee, Arkansas and Kentucky.
As a result, four of those Union states changed their allegiances to Confederate and the other three loyal states suffered as terribly from fighting as any.
Remember, on April 15, 1861 there were only seven Confederate states, but the Confederacy had a plan to conquer at least seven more, plus several western territories.
We know that because it's just what happened.
DiogenesLamp: "The first serious effort at invasion occurred July 21, 1861, and was done according to Lincoln's orders."
No, the first serious event was the Civil War's Pearl Harbor and 9/11 -- the Confederate assault on Fort Sumter.
It immediately resulted in four states switching from Union to Confederate and brought out pro-Confederate forces threatening three others, plus western Virginia.
So, in one brilliant stroke Jefferson Davis nearly doubled the Confederacy's white population and was on the march into the Border States.
All this happened months before a single Confederate soldier was killed by any Union force, and before any Union army invaded a single Confederate state.
No it isn't. Bye!