Was the civil war only fought in the south

No it was not it was all along the east coast

The Civil War was fought in thousands of different places, from southern Pennsylvania to Texas; from New Mexico to the Florida coast. The majority of the fighting took place in the states of Virginia and Tennessee. The Civil War was also contested on the Atlantic Ocean as far off as the coast of France, the Gulf of Mexico, and the brown water of the Mississippi River and its tributaries.