Oklahoma (1907), New Mexico (1912), Arizona (1912), Alaska (1959), and Hawaii (1959) were admitted into the union during the 20th century.
Congress must approve a state's constitution before it can be admitted into the union.
On June 1, 1796 Tennessee became the 16th state of the union.
The first state in the Union was Delaware.
Tennessee was the last state to withdraw from the Union, after a statewide referendum on June 8, 1861. On July 24, 1866 Tennessee became the first Confederate state to be readmitted into the Union.
South Carolina - Friday, May 23, 1788
There is no limit to the number of states that may be admitted to the Union.
50 states have been admitted to the U.S. union.
No states were admitted in 1800.
The first state to be admitted to the Union of States was Delaware. Delaware was the first state to sign the Constitution of the United States.
America is the union. The Union refers to the union of states forming the United States of America.
Alaska was admitted into the Union on January 3, 1959 becoming the 49th state to join the Union. Hawaii was admitted into the Union on August 21, 1959 becoming the 50th state to join the union.
Oregon was admitted to the Union on February 14, 1859 becoming the 33rd state to join the union.
Oklahoma was admitted into the Union on November 16, 1907 becoming the 46th state to join the Union. Theodore Roosevelt was President of the United States when Oklahoma was admitted into the union.
Congress
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Alaska and Hawaii were the last two states admitted into the union. Alaska was admitted into the Union on January 3, 1959 becoming the 49th state to join the Union. Hawaii was admitted into the Union on August 21, 1959 becoming the 50th state to join the union.