SECTION I. Be it enacted by the Senate and House of Representatives of the United States of America in Congress assembled, That the marshals of the several districts of the United States and the secretaries of the territory of the 
United States northwest of the river Ohio, and of the  Mississippi territory, respectively, shall be, and they are hereby authorized and required, under the direction of the Secretary of State, and according to such instructions as be 
shall give pursuant to this act, to cause the number of the inhabitants within their respective districts and  territories to be taken; omitting in such enumeration, Indians not taxed, and distinguishing free persons, including those