"John Brown's body is rotting in the grave; his soul is marching on!"

People who try to claim the civil war wasn't about slavery are fools or liars. The Union Marching song directly stated that the union army was the sword of an angry god coming down on the slavers in the name of freedom.

Mine eyes have seen the glory of the coming of the Lord;

He is trampling out the vintage where the grapes of wrath are stored;

He hath loosed the fateful lightning of His terrible swift sword; His truth is marching on.

Glory! Glory! Hallelujah! Glory! Glory! Hallelujah! Glory! Glory! Hallelujah! His truth is marching on.

I have seen Him in the watch-fires of a hundred circling camps;

They have builded Him an altar in the evening dews and damps;

I can read His righteous sentence by the dim and flaring lamps, His day is marching on.

I have read His fiery gospel writ in rows of burnished steel!

-"As ye deal with my condemners, so with you My grace shall deal!

Let the Hero, born of woman, crush the serpent with his heel, " Since God is marching on.

He has sounded forth the trumpet that shall never call retreat;

He is sifting out the hearts of men before His judgment seat;

Oh, be swift, my soul, to answer Him; be jubilant, my feet! Our God is marching on.

In the beauty of the lilies Christ was born across the sea,

With a glory in His bosom that transfigures you and me;

As He died to make men holy, let us die to make men free! While God is marching on.

People will tell you to your face that the war was about secular economics or some shit. I'm sure the haute boug thought that, but the normal people who volunteered and marched south with guns and uniforms they bought with their own money were on a holy crusade against evil.