Why were state constitutions necessary following the declaration of independence?

State constitutions were necessary following the declaration of independence because of disagreement between the states. There had to be some unity within the territory to become a sovereign state. I hope my answer has come to your help. God bless and have a nice day ahead!

The statistics for the eastern war are grim. more than three-million men died in the fighting, more than nine-million men were wounded, and every major country which participated lost its form of government.