O.
Ohio, settlement, [98] et seq.; routes to, [102] et seq.; formed from part of Northwest Territory, [132]; admitted as State (1802), [132], [165]; means of transportation in, [157]; frontier settlers in, [172]; Southerners in, [174]-[175].
Ohio Company, [39], [80]-[81].
Ohio River, emigrants on, [106]-[109].
Ordinance of 1787, [77]-[78], [131], [180], [181], [182].
Oswego, Pontine surrenders at, [18].
Ottawa (Ill.), French settlement near, [2].
Ouiatanon, [35].