[Footnotei:Ifthepopulationcontinuestodoubleeverytwenty—twoyears，asithasdoneforthelasttwohundredyears，thenumberofinhabitantsintheUnitedStatesin1852willbetwentymillions;in1874，forty—eightmillions;andin1896，ninety—sixmillions。ThismaystillbethecaseevenifthelandsonthewesternslopeoftheRockyMountainsshouldbefoundtobeunfitforcultivation。Theterritorywhichisalreadyoccupiedcaneasilycontainthisnumberofinhabitants。Onehundredmillionsofmendisseminatedoverthesurfaceofthetwenty—fourStates，andthethreedependencies，whichconstitutetheUnion，wouldonlygive762inhabitantstothesquareleague;
thiswouldbefarbelowthemeanpopulationofFrance，whichis1，063tothesquareleague;orofEngland，whichis1，457;anditwouldevenbebelowthepopulationofSwitzerland，forthatcountry，notwithstandingitslakesandmountains，contains783
inhabitantstothesquareleague。See\"MalteBrun，\"vol。vi。p。
92。
[Theactualresulthasfallensomewhatshortofthesecalculations，inspiteofthevastterritorialacquisitionsoftheUnitedStates:butin1899thepopulationisprobablyabouteighty—sevenmillions，includingthepopulationofthePhilippines，Hawaii，andPortoRico。]]