The United States also observes tribal sovereignty of the American Indian nations to a limited degree, as it does with the states' sovereignty. American Indians are U.S. citizens and tribal lands are subject to the jurisdiction of the U.S. Congress and the federal courts. Like the states they have a great deal of autonomy, but also like the states, tribes are not allowed to make war, engage in their own foreign relations, or print and issue currency. Reservations are usually part of a single state, though 12 reservations cross state boundaries. Indian country jurisdiction over civil and criminal matters is shared by tribes, states, and the federal government.