Question

how is the purpose for having a constitution different from its principles​

Answer 1

Answer:

First it creates a national government consisting of a legislative, an executive, and a judicial branch, with a system of checks and balances among the three branches. Second, it divides power between the federal government and the states. And third, it protects various individual liberties of American citizens.

Answer 2

Answer:

Constitutions can declare and define the nature and authority of the political community. They often declare the state's fundamental principles and assumptions, as well as where its sovereignty lies. ... Constitutions can express the identity and values of a national community.