Final answer:
One of the arguments against federalism is that the powerful state and local interests can block progress and impede national plans.
Step-by-step explanation:
One of the arguments against federalism is that the powerful state and local interests can block progress and impede national plans. This means that when state and local governments have conflicting interests, it can be difficult for the national government to implement policies and make progress. For example, if a state has strong interests in a certain industry, they may resist national regulations that could limit their control over that industry.