What principle of government means that the federal court system needs to be in a separate branch from the legislative and executive branches?

Federalism

Explanation:

it gives the united states a flexible system of government. which the national government has the power to act for the country as a whole, and the states have power over many local matters.

these civilizations were located around fertile rivers, where they could produce an abundance of crops

thing is, i'm afraid, you can't.

the most you can do is log out and never log in again.