O

Ohio admitted as State (1802), [78].
Ohio Company of Associates, [72].
Ordinance of 1784, [67], [69]-[71], [75].
Ordinance of 1785, see Land Ordinance of 1785.
Ordinance of 1787, Congress adopts, [72]; stimulus from Ohio Company, [72]-[74]; authorship, 75; provisions, [75]-[77]; successful operation, [77]-[80]; text, [190]-[200].
Oregon, question of military occupation (1825), [77]-[78].
Otto, Louis, French Chargé d’Affaires, letter to Vergennes, [100]-[103].