How Many States Were There in the United States in 1917?

In 1917, the United States comprised 48 states. The last two states to join the Union, Arizona and New Mexico, were admitted in 1912. By 1917, the configuration of the states as we know them today was already established, with no new admissions until Alaska and Hawaii joined much later in 1959. Therefore, during the year 1917, the landscape of the United States was defined by these 48 states, each contributing to the nation’s history and development.