Why were state constitutions neccessary following the Declaration of Independence?

Once the independence of the United States was dictated, it was necessary to create the first laws that would enshrine the sovereignty of the nation and make it applicable in the different states. As a consequence of this need, the different states were enacting their own state constitutions, with Massachusetts being the first in 1780.

These constitutions enshrined within each state the founding principles of the nation, that is, equality, freedom and justice, and the sovereignty of the federal government in the territories of the states.

Explanation:

Once the independence of the United States was dictated, it was necessary to create the first laws that would enshrine the sovereignty of the nation and make it applicable in the different states. As a consequence of this need, the different states were enacting their own state constitutions, with Massachusetts being the first in 1780.

These constitutions enshrined within each state the founding principles of the nation, that is, equality, freedom and justice, and the sovereignty of the federal government in the territories of the states.

missouri compromise of 1820 which prohibited slavery