Delaware and Pennsylvania; though technically the Union didn't exist until the ninth state (New Hampshire) ratified the Constitution on June 21, 1788.
The first two States after the original 13 colonies to join the Union.
Alaska and Hawaii
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.
Delaware was the first US State and Pennsylvania became the second five days later. Only three States joined in 1787 with New Jersey as number three. By the end of 1788 there were only eleven US States.
Arizona (48th state) was the last contiguous state to join the Union on February 14, 1912. The only two states after that were Hawaii and Alaska in 1959.
No state joined the union during 1911. Oklahoma was admitted into the Union on November 16, 1907 becoming the 46th state to join the Union. New Mexico was admitted into the Union on January 6, 1912 becoming the 47th state to join the union.
Hawaii was admitted into the Union on August 21, 1959 becoming the 50th state to join 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. Alaska was admitted into the Union on January 3, 1959 becoming the 49th state to join 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.
The 49th and 50th state to join the union are Alaska and Hawaii.
Arizona and New Mexico were the last two southwestern states to join the union. Arizona was admitted into the Union on February 14, 1912 becoming the 48th state to join the Union. New Mexico was admitted into the Union on January 6, 1912 becoming the 47th state to join the union.
Louisiana was admitted into the Union on April 30, 1812 becoming the 18th state to join the Union.Mississippi was admitted into the Union on December 10, 1817 becoming the 20th state to join the Union.