January 6, 1912, New Mexico, having complied with all conditions, was
formally admitted into the Union as the forty-seventh State.
Arizona, having an area of 113,000 square miles, was organized as a
territory in 1863 and appeared in the federal census reports for the
first time in 1870 with a population of 9,658. From 1870 to 1890 its
growth in population was rapid, increasing a little more than four times
during the decade 1870-1880 and doubling during the succeeding ten
years. The population in 1900 was 122,931 and in 1910 it was 204,354.
During the last decade, therefore, the increase in population has been
66.2 per cent, while the percentage of increase in the United States as