Strong circumstantial evidence supporting piracy as a cause of the Civil War.

[BeyondKnowledge]

Sorry, I assumed you had my previous posts in mind.  I have added a paragraph in the OP and here, in medium size bold font, which restates the missing information. 

"The pirates must have supported an economy in their home ports.  Tje people who had provided their food, clothing, housing, ship repair, and so forth were now at risk of starving.  The surviving pirates were also.  There may have been no room where they were from to simply take up farming or something.  

Some of them may have come here and moved on to land which the Southeast tribes had vacated.  It is possible they wanted to create a nation which ran the way they wanted, or maybe they returned to a bit of piracy because they had more coastline and rivers to hide their ships, more ability to false-flag them, and greater access to the shipping of nations whose navies were not so advanced.  Perhaps then the nations of Europe and South America began to goad them into rebelling.  The US had either agreed to take them or had failed to use adequate oversight into who was allowed to move here.  Either way, the European and South American powers may have had the right to hold the USA responsible."  

I take exception to your phrasing of "Southeastern tribes had vacated". They were forced off their land by the government and that shows you know little of the history of that area and period.

England and France officially stayed neutral but unofficially France supported the South. How exactly was this holding the Americans responsible for anything?

Again what does any of your reasoning have to do with the American Civil War?