The Northwest ordinance of 1787 allowed for the creation of the Northwest Territory. Five states were created in this land east of the Mississippi River and between the Ohio River and the Great Lakes. The ordinance created the state boundaries. These United States History maps, now available from Universal Map, are a valuable visual aid in understanding American History. All maps in this series are markable with a dry erase or water-soluble marker. Durably laminated maps measure 46 x 32 or 36 x 48. Mounted on roller with backboard. Meets U.S. History curriculum requirements.These maps are a new special order item. Please allow 2-4 weeks for delivery on multiple wall map custom sets. Save money and space by mounting History Wall Maps together as a set on one spring roller mounted wall map operation. This product is ideal for public, private, parochial, and home schools.