Why were state constitutions significant when the u. s. constitution was written?

State Constitutions Significant when the U.S. Constitution was written because states had their own constitution way back before the U.S. Constitution was even written.

Explanation:

The States or Colonies had their own written documented Constitution way back since the American Constitution was even written.

A total of about 150 Constitution States have written  Since the Declaration of Independence, with several states writing new Constitutions frequently.

State Constitutions include the Role, Structure, financing of state and local level government.