Why did Southerners believe preventing the expansion of slavery was an attack on their way of life?

Defenders of slavery argued that the sudden end to the slave economy would have had a profound and killing economic impact in the South where reliance on slave labor was the foundation of their economy. ... The cotton economy would collapse. The tobacco crop would dry in the fields.

Explanation:

well we know that it was fought between america and the united kingdom based on that i assume people consider the second war of independence because brtiain and england (uk)   the uk is made up of england and i assume thats why it was considered that

b because they both had so of the same chosen rules