Remember that a confederation is a league, alliance or union, especially of states. Remember that the word "confederation" may also refer to the state of being in such a league, alliance or union.
Use the word "confederation" with a definite article like "this" when a confederation is the subject of your sentence. For example, "This confederation of states offers its citizens neither advantage nor freedom."
Use the word "confederation" with the preposition "of" and an article to describe a characteristic of a confederation. For example, "The inefficiencies of the confederation led to its dissolution."
Use the word "confederation" with the preposition "of" and an article like "the" to describe something that is possessed by or attributed to a confederation. For example, "The earnestness of the confederation could not defeat the logic of reality."
Use the word "confederation" after a verb and an article like "the" when a confederation is direct object of a verb in your sentence. For example, "Surely we hated the confederation for its willfully malicious acts."
Use the word "confederation" with a preposition like "to" and an article in a sentence when a confederation is the indirect object of a verb. For example, "The Athenians dispatched messengers and gifts to the confederation."