The central biloxi motel located in the state of mississippi has 216 rooms available to guests. the motel is readily accessible to interstate highways 75 and 85 and to state highways 23 and 41. the motel solicits patronage from outside the state of mississippi through various national advertising media, including magazines of national circulation, and it maintains more than 50 billboards and highway signs within the state. approximately 75 percent of the motel's registered guests are from out of state. the central biloxi motel refuses to rent rooms to blacks. what part of the constution is federal civil rights based on?