The preamble describes the constitution as an agreement among the thirteen original states true or false

Its false, the preamble doesn't describe the constitution as an agreement among the thirteen states. Preamble is a brief introductory statement that sets out guiding purpose of a document such as a constitution, and indicates the source from which the document derives its authority, meaning and the people. In addition it also describes clearly the hopes and aspiration of the people and also the ideals of a nation.