POPULATION. - When Harrison was elected in 1840, the population of our country was 17,000,000, spread over twenty-six states and three territories. Of these millions several hundred thousand had come from the Old World. No records of such arrivals were kept before 1820; since that date careful records have been made, and from them it appears that between 1820 and 1840 about 750,000 immigrants came to our shores. They were chiefly from Ireland, England, and Germany. [1]