Plzz help me fast plz be 90 to 80% sure Which statement best represents the effects of sectionalism on the United States prior to the Civil War?

States in different sections agreed to limit the spread of slavery.

Northern and Southern states developed significantly differences on key issues.

Federal laws on slavery only affected certain sections of the country

Western states could not grant citizen's rights to African Americans.

Northern and Southern states developed significantly differences of key issues. Have a wonderful day! <3

a king decides to declare war on a neighboring country without the input of any advisers

i believe it would influence their own way of understanding things. it shall be a foundation where they can draw or start an argument.   historians are also  scientists that  have their tools of analysis and expertise to unlock a variety of difficulties such as relationships of man, origin, politics, economy, and culture. based on facts and understanding on these areas, they may shade light to extract ideas and develop options to validate a hypothesis or debunk it.