Where was the first major battle of the civil war

It was in Virginia

Explanation:

Known in the north as the Battle of Bull Run and in the South as the Battle of Manassas, this battle, fought on July 21 1861 in Virginia was the first major battle of the Civil War. On July 21, 1861, Union and Confederate armies clashed near Manassas Junction, Virginia, in the first major land battle of the American Civil War.  It was a Confederate victory

The First Battle of Bull Run (the name used by Union forces), also known as the First Battle of Manassas (the name used by Confederate forces), was the first major battle of the American Civil War and was a Confederate victory.

Explanation:

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