States and Their Admission to the Union

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With the founding of the United States, the thirteen original colonies became the first thirteen states. Over time 37 more states were added to the Union. According to the US Constitution,

"New States may be admitted by the Congress into this Union; but no new States shall be formed or erected within the Jurisdiction of any other State; nor any State be formed by the Junction of two or more States, or Parts of States, without the Consent of the Legislatures of the States concerned as well as of the Congress."

The creation of West Virginia did not violate this clause because West Virginia was created from Virginia during the American Civil War as it did not wish to join the Confederacy. The only other state added during the Civil War was Nevada. 

Five states were added during the 20th century. The last states to be added to the US were Alaska and Hawaii in 1959.

The following table lists each state with the date it entered the union.

States and Their Dates of Admission to the Union

 StateDate Admitted to the Union
1DelawareDec. 7, 1787
2PennsylvaniaDec. 12, 1787
3New JerseyDec. 18, 1787
4GeorgiaJan. 2, 1788
5ConnecticutJan. 9, 1788
6MassachusettsFeb. 6, 1788
7MarylandApril 28, 1788
8South CarolinaMay 23, 1788
9New HampshireJune 21, 1788
10VirginiaJune 25, 1788
11New YorkJuly 26, 1788
12North CarolinaNov. 21, 1789
13Rhode IslandMay 29, 1790
14VermontMarch 4, 1791
15KentuckyJune 1,1792
16TennesseeJune 1, 1796
17OhioMarch 1, 1803
18LouisianaApril 30, 1812
19IndianaDec.11, 1816
20MississippiDec.10, 1817
21IllinoisDec.3, 1818
22AlabamaDec.14, 1819
23MaineMarch 15, 1820
24MissouriAug. 10, 1821
25ArkansasJune 15, 1836
26MichiganJan. 26, 1837
27FloridaMarch 3, 1845
28TexasDec.29, 1845
29IowaDec.28, 1846
30WisconsinMay 26, 1848
31CaliforniaSept. 9, 1850
32MinnesotaMay 11, 1858
33OregonFeb. 14, 1859
34KansasJan. 29, 1861
35West VirginiaJune 20, 1863
36NevadaOctober 31, 1864
37NebraskaMarch 1, 1867
38ColoradoAug. 1, 1876
39North DakotaNov. 2, 1889
40South DakotaNov. 2, 1889
41MontanaNov. 8, 1889
42WashingtonNov. 11, 1889
43IdahoJuly 3, 1890
44WyomingJuly 10, 1890
45UtahJan. 4, 1896
46OklahomaNov. 16, 1907
47New MexicoJan. 6, 1912
48ArizonaFeb. 14, 1912
49AlaskaJan. 3, 1959
50HawaiiAug. 21, 1959