DiogenesLamp learns & remembers only what he wishes were true, not any actual facts.
In this case what's true is that in 1860 Deep South cotton accounted for roughly 50% of US exports -- about $200 million of the $400 million total exports.
This in a US economy whose GDP totaled ~$4.5 billion.
So Deep South cotton exports represented about 5% of total US economic activity.
Estimates of "the South's" total contribution to total US GDP run in the range of 15%.
And, indeed, when the Confederacy was eliminated from the US economy in 1861, then 15% is roughly the decline in Federal tariff revenues which resulted.
One reason Southern cotton exports of $200 million (50% of total exports) did not translate into 50% of Federal tariff revenues is because Southerners in 1860 did not spend their own revenues on foreign imports -- rather they "imported" about $200 million worth of manufactured goods from the North, and that's how Northerners earned the money to pay for foreign imports.
When the Confederate economy was removed from the United States in 1861, there was a temporary decline in the Union of around 15%, but within a year those losses were made up and total Union revenues soon doubled, then doubled again without any Confederate inputs.
All of which DiogenesLamp well knows, but refuses to acknowledge because it doesn't support his pro-Confederate narrative.
Typical Democrat.
DiogenesLamp: "Fort Sumter is more akin to a slap.
It never had a chance of seriously hurting the North other than ego."
Jefferson Davis well knew he was starting Civil War when he ordered CSA General Beauregard to "reduce" Fort Sumter.
Davis was warned:
All of which DiogenesLamp well knows, but as a pro-Confederate propagandist he refuses to acknowledge.
73% of US Government revenues.