Heya! You might be interested in some of the threads in our American Civil War, European Perspectives FAQ Section, especially:
What was the opinion of the people and workers of Northern England towards the Union or Confederate causes during the American Civil War, and the Cotton Famine that resulted from it? answered by /u/agentdcf and /u/Borimi
How did Europeans nations reaction the U.S. Civil War? by /u/the_alaskan
Hope these are helpful!
As a corollary: what was the Brazilian reaction to the civil war? As the only other major slave holding nation at the time (I think?), I would think the Civil War would've piqued their interest.