[brownsfan]

From ditto:
"...you need to understand that tariffs, under the US Constitution, can not be and have never been applied to exports, from the South or anywhere else. They are only applied to imports..."

From bowzer313:
"...Federal revenue was raised through taxation (tariffs) on American goods sold to foreign markets (exports)..."

Ok, I'm confused.

[Alas Babylon!]

Export taxes are unconstitutional. See the following:

US Constitution

Article I, Section 9:
Clause 5: No Tax or Duty shall be laid on Articles exported from any State.