I.
Illinois, trade with, [66]; growth of population, [116], [156]; canal fever, [157], [161]; railway projects, [171]; influence of river trade on, [180].
Illinois (lake steamer), [168].
Illinois Central Railroad, [170].
Illinois-Michigan Canal, [157]-[158], [161], [167], [168].
Illinois River, French on, [20].
Independence (Mo.), Overland Trail from, [189].
Indiana, migration to, [67]; growth of population, [116], [156]; canal enthusiasm, [161]; railway projects, [171]; influence of river trade on, [180].
Indians, trails, [14], [18]; pack-horse trade with, [21], [27].
Ingles ferry, [47].
Iowa, influence of river trade on, [180].