Why do U. S. states have their own constitutions?

The u.s. states have their own constitutions the country is divided into states and the Constitution allows states many powers. Each state then has to run itself and each state has the power to write its own state constitution. The 50 states each then had to design and create their own state government the state constitutions do exactly that.

Explanation:

“i think it is very plausible that if there are five votes to end the death penalty, it could be with the people who are on the court right now,” - smith

so basically it is not clearly and consistently imposed