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 U.S. 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

State Date Admitted to the Union
1 Delaware Dec. 7, 1787
2 Pennsylvania Dec. 12, 1787
3 New Jersey Dec. 18, 1787
4 Georgia Jan. 2, 1788
5 Connecticut Jan. 9, 1788
6 Massachusetts Feb. 6, 1788
7 Maryland April 28, 1788
8 South Carolina May 23, 1788
9 New Hampshire June 21, 1788
10 Virginia June 25, 1788
11 New York July 26, 1788
12 North Carolina Nov. 21, 1789
13 Rhode Island May 29, 1790
14 Vermont March 4, 1791
15 Kentucky June 1,1792
16 Tennessee June 1, 1796
17 Ohio March 1, 1803
18 Louisiana April 30, 1812
19 Indiana Dec.11, 1816
20 Mississippi Dec.10, 1817
21 Illinois Dec.3, 1818
22 Alabama Dec.14, 1819
23 Maine March 15, 1820
24 Missouri Aug. 10, 1821
25 Arkansas June 15, 1836
26 Michigan Jan. 26, 1837
27 Florida March 3, 1845
28 Texas Dec.29, 1845
29 Iowa Dec.28, 1846
30 Wisconsin May 26, 1848
31 California Sept. 9, 1850
32 Minnesota May 11, 1858
33 Oregon Feb. 14, 1859
34 Kansas Jan. 29, 1861
35 West Virginia June 20, 1863
36 Nevada October 31, 1864
37 Nebraska March 1, 1867
38 Colorado Aug. 1, 1876
39 North Dakota Nov. 2, 1889
40 South Dakota Nov. 2, 1889
41 Montana Nov. 8, 1889
42 Washington Nov. 11, 1889
43 Idaho July 3, 1890
44 Wyoming July 10, 1890
45 Utah Jan. 4, 1896
46 Oklahoma Nov. 16, 1907
47 New Mexico Jan. 6, 1912
48 Arizona Feb. 14, 1912
49 Alaska Jan. 3, 1959
50 Hawaii Aug. 21, 1959