What is state and state system?

Answer 1

You may be referring to the sovereign sub-national entities that were party to the conventionalizing and ratification of the United States Constitution, or to admission authorized by other States and the Congress according to the U.S. Constitution, called the "Several States" in the U.S. Constitution.

The States are dual sovereigns with the federal government or the United States, and have their own statutes, common law, and branches of government under both a State constitution and the United States Constitution.

You may also be referring to the United States Department of State (the "State Department"), which is headed by the Secretary of State (the chief foreign-affairs officer under the United States), which is the executive agency responsible for certain aspects of the conduct of the foreign affairs of the United States.

Answer 2

A state is a political and territorial unit governed by a centralized authority. It typically has defined boundaries, a permanent population, and the ability to enter into relations with other states. The state system refers to the collective relationship and interaction between different states, often governed by principles of international law and diplomacy.