Select all the correct answers. Which two sentences explain the North's opposition to the use of slavery in the South?
The population of enslaved people increased the South's representation in Congress.
Northerners saw slavery as an immoral and unjust practice.
Northern farmers couldn’t compete with Southern plantations supported by the labor of enslaved people.
Southerners refused to trade enslaved people with plantation owners in the North.
The North believed that slavery prevented the South from using modern farm equipment.