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Article Four describes the relationship between the states and the Federal government and the states. Congress is permitted to regulate the manner in which proof of such acts, records or proceedings may be admitted. The "privileges and immunities" clause prohibits state governments from discriminating against citizens of other states in favor of resident citizens. It also establishes extradition between the states, as well as laying down a legal basis for freedom of movement and travel amongst the states. Today citizens who live near state borders take this for granted; but in the days of the Articles of Confederation, crossing state lines was often a much more costly process, Also provides for the creation and admission of new states. The Territorial Clause gives Congress the power to make rules for disposing of Federal property and governing non-state territories of the United States. Finally, the fourth section requires the United States to guarantee to each state arepublican form of government, and to protect the states from invasion and violence.