Question

Why did states with smaller populations support the New Jersey Plan?

Answer 1

The larger states wanted a larger influence in Congress because they has a larger population. What did small states favor the New Jersey Plan? Smaller states like this plan because it gave them equal representation in Congress

Answer 2

The main reason why the states with lesser and smaller populations maintained the New Jersey Plan was since this plan would put two representatives in Congress irrespective of the state size it had , as opposed to making symbol based on population size  which would always favor the larger states.