Why statements about the northern states in the 1780 is accurate

Accurate statements about the words "who" and "whom" are: . Both "who" and "whom" are interrogative pronouns. . Both "who" and "whom" are relative pronouns. . The pronoun "who" is a subject pronoun. . The pronoun 'Whom" is an object pronoun.

They had far fewer large cities than the southern states. They generally had less enslaved labor than the southern states.  I dont know if thsi is one of your answers

a. because the u.s. was the leading with the most technology, economy, etc. also was teamed with other allies witch boosted the economy and materials to improve technology and use it.