The United States recognizes the right of these tribes to self-government and supports their tribal sovereignty and self-determination. These tribes possess the right to establish the legal requirements for membership. They may form their own government, enforce laws (both civil and criminal), tax, license and regulate activities, zone, and exclude people from tribal territories. Limitations on tribal powers of self-government include the same limitations applicable to states; for example, neither tribes nor states have the power to make war, engage in foreign relations, or coin money.