One thing I note is eight months after the civil war started France invaded Mexico. After the Civil War ended the US made sure they had to leave. And then helpe

One thing I note is eight months after the civil war started France invaded Mexico. After the Civil War ended the US made sure they had to leave. And then helped Mexico kill Maximilian. I feel like in that context the South's attacks on the United States Southern coastal defenses wasn't acceptable. But yeah the south leaving the Union was all about slavery.