There are limits that the state encounters such as making private treaties with foreign governments, coining money, anything that might effect the entire government system as a whole. This does not mean the federal government has more power they are limited to what they can do to the states as well. The national government must not interfere with states in such a way that it effects the states ability to perform their responsibilities, example would be interstate commerce. The states role in the federal system has grown faster than that of the federal government. The states supervision has been increased through the provision of aid to their localities, through financial grants, and through control of the power to raise revenue for all subdivisions. Federal grants have served to the development of state capabilities and have helped enhance their strength. They have helped by broadening the programs they can offer their citizens and strengthening state administration of those programs.Now do states serve in the main purpose to prevent the formation of tyranny? In the general sense they do, with the division of power among the federal and state government, no one power may come into formation and become the central government. Each states have representatives which come together to make decisions for the people, although one majority may rule in certain areas of the government, this is not tyranny because they cannot take complete control over state and federal actions. All the power is derived from the one source, which is the constitution, and the constitution was created with federalism in mind. It was made so that power may be divided evenly. With the states allowed to have their own government, they are able to make their own decisions with some restrictions.With the states making their own decisions it makes it less likely that formation of any kind of tyranny could take place.