In 1850, most northerners would never have dreamed they would be fighting a war against the south. why did northern public opinion change

The correct answer for this question is this one: "In 1850, most Northerners would never have dreamed they would be fighting a war against the South. The reason behind this is that they wanted to stay a complete country basically. The south wanted to break off because they believed in more slave labor while the north was based more on factories."

Independent executive agencies are more specialised.