It wasn't a blunder. The South was always mortgaged to The City of London. The rootless cosmopolitans that run international finance always, always use imported slave labor (or even better, native slave labor) to work their mines and t heir plantations.

It was planned. It is their modus operandi. they do it all the time, every single time. It also helped create a fissure between USA nationalist and Southern plantation owners. A win-win for globalist financiers. They destroy nationalism wherever the find it. Nationalism directly opposes the globalist criminal cabals of middlemen and cosmopolitan financiers.