These are the northernmost land battles, I believe there were naval battles fought farther north.
East of the Mississippi - St. Albans, Vermont
West of the Mississippi - Croton, Iowa
In the Southern slave-states. Gettysburg was the only battle fought in a free state (Pennsylvania), during Lee's abortive invasion of the North.
It was mostly fought in the South, but I'm not sure in what state the majority was fought in. About half of the major battles were fought in Virginia and Tennessee. However, the battles that formed the "turning points" of the war were in Gettysburg, Pennsylvania, and Vicksburg, Mississippi. The first battle was in Charleston, South Carolina and the last major battle was in North Carolina.
Kansas
In the American civil war the Rebels (11 southern states) fought the North over issues of slavery and state rights
In South Carolina. It was the Battle of Fort Sumter.
Pennsylvania
The battle was fought November 23 - 25 in the Confederate state of Tennessee.
if you mean the U.S. civil war, it was mostly fought in Virginia. The last battle of the civil war was the battle of new Orleans (LA), which was fought two weeks after the surrender of Lee's army at appomatox courthouse (VA).
Battle of Palmito Ranch. Refer to Related Link below.
This battle of the American Civil War was fought in the border state of Maryland.
Nashville
In the Southern slave-states. Gettysburg was the only battle fought in a free state (Pennsylvania), during Lee's abortive invasion of the North.
Both Valley Forge and Gettysburg are in Pennsylvania. However, Valley Forge was the location of a 6-month long training encampment and there was not a battle fought at the location.
The Battle of Trenton was fought at Trenton, New Jersey.
This most famous and most important Civil War Battle occurred over three hot summer days, July 1 to July 3, 1863, around the small market town of Gettysburg, Pennsylvania. It began as a skirmish but by its end involved 160,000 Americans.
The battles were fought in Massachusetts
Maryland.