You've already conceded the 50%, so i've only got to come up with the other 30%. The link I constantly post to that book "Southern Wealth and Northern Profit" gets me up to 73%. The 80% number I actually got from another Freeper who have told me (and told you too) that he got the numbers from the official record. I don't remember which Freeper it was that said this, but I know him to be among the group that normally argues about this stuff.
So basically, the 1/4 of the Citizens who lived in the South produced 80% of all the European trade.
But regardless of how often you post that here, it's still fake news.
The real facts can be found here:
But the numbers from 1861 tell us that not all those "Southern exports" actually came from the South.
We see that cotton certainly did, and those exports fell 80%.
However, tobacco exports fell only 15% thus demonstrating they were not truly from "the South" at all.
You need to wrap your mind around the facts, FRiend.