The money guys from both sides cost us 650,000 folks and severe destruction. It was a tax that started it. Make no mistake that slavery became an issue but it wasn’t the kindling that started the fire.
Except that secession was started before the tax was passed.
Cause and effect. The one that occurs first may, or may not be the cause.
The one that occurs last can never be the cause.
Secession, or the pretense at it, was the cause of the tariff increase being passed.