The Union - very much so.
Pennsylvania had a strong free-soil tradition, and its border with slave-owning Maryland was the Mason-Dixon line that separated North from South.
Lee placed a high priority on invading Pennsylvania, both for strategic and symbolic reasons.
When he twice failed in this, at Antietam and then Gettysburg, he would shake his first at the sky. "Even the skies are against me in Pennsylvania!" he wailed.
The US State of Michigan remained loyal to the government of The United States. There was no chance that it would join the Confederacy.
Mississippi was a Confederate state
In Viirginia, which was a Confederate state
Illinois was a Union state during the Civil War.
The confederate states that bordered the union states varied by time, as some states changed sides or became neutral. Virginia was the only one that stayed the same, bordering Ohio, Pennsylvania and Maryland.
Tennessee...it use to be a confederate state but later joined the union
The only Union states that WERE invaded by Confederate military forces were Pennsylvania and Maryland.
The border state of Maryland was a central state in the US Civil War, and had the border state of Delaware on its east, the Union State of Pennsylvania to its north, and the Confederate state of Virginia to its south.
Confederate state
Union state, with quite a few Confederate sympathisers.
Mississippi was a Confederate state
Mississippi was a Confederate state
Mississippi is a confederate state
Union
Pennsylvania was the second state to join the union.
In Viirginia, which was a Confederate state
Gettysburg, Pennsylvania.
it was a confederate state because the confederate capital was located there