the purpose of a(n) is to allow the writer to express a viewpoint that opposes a stated opinion on a topic.

Anti-federalists argue that THE CONSTITUTION WOULD MAKE STATES LESS POWERFUL.
Anti-federalist is a movement in USA in the early years, which opposed the creation of a strong central government and the ratification of the constitution that was put forward in 1787. They felt that the constitution will make the federal government stronger and the states weaker.