What effects did the northwest ordinance have? select all that apply. 1.) it stopped the spread of slavery north of the ohio river. 2.) it encouraged the spread of slavery north of the ohio river 3.) it divided lands north of the ohio river into independent states. 4.) it provided a path to statehood for land north of the ohio river. 5.) it provided free land to settlers west of the appalachian mountains. 6.) it restricted colonial settlement in land west of the appalachian mountains.