States admitted in the 20th century: Oklahoma, New Mexico, Arizona, Alaska, and Hawaii.
Arizona Alaska New Mexico Hawaii Oklahoma
Oklahoma (1907), New Mexico (1912), Arizona (1912), Alaska (1959), and Hawaii (1959) were admitted into the union during the 20th century.
Tennessee, Kentucky and Vermont
Arizona New Mexico Oklahoma Texas
Oklahoma (1907), New Mexico (1912), Arizona (1912), Alaska (1959), and Hawaii (1959) were admitted to the union during the 20th century.
Depending on how you define what the southwestern region of the US is, the states in the southwest region of the US are: California Arizona New Mexico Nevada Utah Colorado Texas Oklahoma
There were 45 US States in 1898. Oklahoma, New Mexico, Arizona, Alaska and Hawaii had not yet become US States.
US Naval Base, US Territory of Hawaii. Oklahoma, New Mexico, Arizona, Alaska, and Hawaii were new 20th century states.
Yes, they are all US States.
Arizona, New Mexico, Oklahoma, and Texas.
Oklahoma, Texas, New Mexico, and Arizona make up the southwestern part of the united states.