The states were added to the Union in the following order, beginning with the original 13 colonies that became the first states after declaring independence from Great Britain in 1776:
Original 13 States (1776–1788)
- Delaware – December 7, 1787
- Pennsylvania – December 12, 1787
- New Jersey – December 18, 1787
- Georgia – January 2, 1788
- Connecticut – January 9, 1788
- Massachusetts – February 6, 1788
- Maryland – April 28, 1788
- South Carolina – May 23, 1788
- New Hampshire – June 21, 1788
- Virginia – June 25, 1788
- New York – July 26, 1788
- North Carolina – November 21, 1789
- Rhode Island – May 29, 1790
Subsequent States Added (1791–1959)
- Vermont – March 4, 1791
- Kentucky – June 1, 1792
- Tennessee – June 1, 1796
- Ohio – March 1, 1803
- Louisiana – April 30, 1812
- Indiana – December 11, 1816
- Mississippi – December 10, 1817
- Illinois – December 3, 1818
- Alabama – December 14, 1819
- Maine – March 15, 1820
- Missouri – August 10, 1821
- Arkansas – June 15, 1836
- Michigan – January 26, 1837
- Florida – March 3, 1845
- Texas – December 29, 1845
- Iowa – December 28, 1846
- Wisconsin – May 29, 1848
- California – September 9, 1850
- Minnesota – May 11, 1858
- Oregon – February 14, 1859
- Kansas – January 29, 1861
- West Virginia – June 20, 1863
- Nevada – October 31, 1864
- Nebraska – March 1, 1867
- Colorado – August 1, 1876
- North Dakota – November 2, 1889
- South Dakota – November 2, 1889
- Montana – November 8, 1889
- Washington – November 11, 1889
- Idaho – July 3, 1890
- Wyoming – July 10, 1890
- Utah – January 4, 1896
- Oklahoma – November 16, 1907
- New Mexico – January 6, 1912
- Arizona – February 14, 1912
- Alaska – January 3, 1959
- Hawaii – August 21, 1959
Each of these states joined the Union in the order listed above, culminating with Hawaii as the 50th state.