The War of Confederate Aggression began with Confederate seizures of dozens of Federal properties -- forts, ships, arsenals, mints, etc. -- threats against Federal officials, firings on Union ships, military assault on Fort Sumter and a formal declaration of war against the United States, May 6, 1861.
Please see this post for a summary.
In the war's first 12 month 52 battles in 13 states or territories were fought, of which 30 battles happened in six Union states or territories -- more than half.
It was not until well into the war that its focus clearly shifted to the Confederacy.
But it is the political DNA of Democrats to accuse Republicans of their own wrong-doings, and that's all we're seeing here from Jeffersondem.
Even in the war's third year, from April 1863 to April 1864, there were battles in 10 Union states & territories and 11 Confederate states, so that by April 1864 63 total battles were in Union states, or 26% of the 241 cumulative battles.
If you ask, when was the last battle between Confederate & Union forces in a Union state, well, in October 1864 there were eight such battles in Kansas & Missouri, ending in the Second Battle of Newtonia, October 28, 1864, a Union victory.
According to this source all told, the Confederate War of Aggression was fought 384 major battles over 18 Union states & territories and, oh yes, in 11 Confederate states.
But Jefferson Davis' War focused first in Union regions and did not predominently shift to the Confederacy until after May of 1862.