During the civil war, the union and the confederacy battled in the west for control of major cities. west virginia. key rivers. texas. answer is c

The correct answer is "key rivers".

Explanation:

The rivers were an important factors during Civil War, serving as lines of trade, transport of supplies and communication among the troops. The Union and the Confederacy armies fought in the West looking to control key rivers in that region in what is known as "The River War". The event that started this conflict was the Union taking control of the Mississippi River.