Why is federalism one of the central principles of american constitutionalism?

Federalism is one of the central principles of American Constitutionalism because helps in the dividing and sharing of power between state and national governments, thus, making organization of the government manageable and standardized.

The other major principles of American Constitutionalism are:

Popular Sovereignty; Checks and Balances; Limited Power of the Government; Separation of Branches.

answer; i believe that the correct answer is,lies(political rhetoric);

offline recommendation systems option b

because recommendation systems produce a list of two ways

1. through collaborative filtering

or

2. through content-based filtering