POPULATION

1860. 1870, 1880, Illinois... ......, 1,711,000 2,539,000 3,077,000 Missouri sers. 1,182,000 1,221,295 2,168,308 Wisconsin... 775,000 1,054,000 1,315,497 Michigan ......... 749,000 1,184,000 1,636,937 TOM nrricrcersn 674,913 1,194,000 1,624,615 Californie... 379,994 560,000 864,000 Minnésota..….....…., 122,000 439,000 780,000 Kansas... 107,000 364,000 996,000 Orégon..........…. 52,000 90,000 174,000 TA iso sens 40,000 86,700 144,000 Colorado 34,200 39,864 194,327 Nébraska ........ 28,000 122,093 452,400 . Washington ...…. 11,594 23,955 75,118 Névada............…. 6,857 42,490 62,266 Dakota... 4,837 14,180 135,177 TA Oise MATE 15,000 32,610 MORÉATM us rec lé testserrecense 20,595 39,159 NVYOMINB Nice rsesstesrse . 9,118 20,784 5,828,395 9,519,790 13,692,198 5,828,395 Augmentation ssssesssosronosoresoreses 7,863,803 Moyenne par année... 393,190

Puis vient l'augmentation de la richesse qui suit fidèlement,

dans chaque Etat, la multiplication des voies ferrées :