O.

Ogden, Aaron, vs. Gibbon, 132.

Ohio, migration to, 67; growth of population, 116, 156; and Cumberland Road, 117; canals, 157-160; admitted as State (1802), 158; railroads, 171; influence of river trade on, 180.

Ohio and Lake Erie Company, 145.

Ohio Canal, 157, 159, 168, 169.

Ohio River, Washington and, 8, 12; access of French and English to, 25; value of cargoes on (1800), 74; Baltimore and Ohio Railroad reaches (1853), 151, 183; navigation, 180.

Old Bay Path, 15, 16.

Ontario (steamboat), 156.

Orange, Fort (Albany), 16; see also Albany.

Ordinance of 1787, 170.

Oregon, western trail to, 188;

effect of acquisition on transportation, 191.

Orleans (steamboat), 78.

Ormsbee, of Connecticut, makes steamboat model, 104.

Ottawa (Ill.) canal terminal, 162.

Overland Stage Company, 189.

Overland Trail, 189, 191.