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Date |
Event(s) |
| 1 | 1815 | - 1815—1821: A depression lasts almost 6 years and into 1821.
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| 2 | 1818 | - 3 Dec 1818: Illinois becomes the 21st state.
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| 3 | 1819 | - 1819: Cincinnati, Hamilton County, Ohio is incorporated as a city.
- 23 Oct 1819: The first segment of the Erie Canal opens in Oneida County, New York between Rome and Utica.
- 25 Oct 1819: Hamilton County, Tennessee is formed with land from Rhea County, Tennessee.
- 13 Nov 1819: McMinn County, Tennessee is formed with land ceded by the Cherokee Indians.
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| 4 | 1820 | - 1820: United States population — 9,638,453.
- 1 Feb 1820: Scott County, Indiana is formed with land from Clark County, Jackson County, Jefferson County, Jennings County and Washington County, Indiana.
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| 5 | 1821 | - 10 Aug 1821: Missouri becomes the 24th state.
- 3 Nov 1821: Calloway County, Kentucky is formed with land from Hickman County.
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| 6 | 1823 | - 24 Oct 1823: Obion County, Tennessee is formed with land from the Western District of Tennessee.
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| 7 | 1824 | - 1824: Graves County, Kentucky is formed with land from Hickman County.
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| 8 | 1825 | - 1825—1826: A depression lasts 13 months and into 1826.
- 26 Oct 1825: The complete Erie Canal opens in New York. It provides a waterway from the Hudson River near Albany, Albany County, New York to Lake Erie at Buffalo, Erie County, New York.
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| 9 | 1826 | - 1826: The Blacksnake Hills fur trading post is founded near the site of what will become St. Joseph, Buchanan County, Missouri in 1843.
- 4 Jul 1826: Former Presidents Thomas Jefferson and John Adams die on the 50th anniversary of the formal adoption of the Declaration of Independence. Jefferson is age 83, and Adams is age 90.
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| 10 | 1827 | - 6 Aug 1827: The United States and Great Britain agree to the joint occupation of the Oregon Territory.
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| 11 | 1830 | - 1830: United States population — 12,866,020.
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| 12 | 1833 | - 1833—1834: A depression lasts 9 months and into 1834.
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| 13 | 1834 | - 1 Oct 1834: Des Moines County, Iowa Territory is formed with land from the Michigan Territory. However, it is not yet organized and will not be organized until December 17, 1836.
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| 14 | 1835 | - 20 Jun 1835: Lucas County, Ohio is formed with land from Sandusky County and Wood County, Ohio.
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| 15 | 1836 | - 10 Feb 1836: Bradley County, Tennessee is formed with land ceded by the Cherokee Indians under the Treaty of New Echota.
- 2 Mar 1836: The Republic of Texas is established in territory claimed by Mexico.
- 6 Mar 1836: The Alamo falls at what is now San Antonio, Bexar County, Texas.
- 8 Mar 1836: Clarke County, Virginia is formed with land from Frederick County, Virginia.
- 2 May 1836: Meigs County, Tennessee is formed with land from Rhea County, Tennessee.
- 7 Dec 1836: Lee County, Iowa Territory is formed with land from Des Moines County. [The Wisconsin Legislature has jurisdiction over this land and will retain control until 1838.]
- 7 Dec 1836: Henry County, Iowa Territory is formed with land from Des Moines County. [The Wisconsin Legislature has jurisdiction over this land and will retain control until 1838.]
- 17 Dec 1836: Des Moines County is finally organized in the Iowa Territory.
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| 16 | 1837 | - 10 May 1837—1843: The Panic of 1837 begins. A depression lasts 6 years and into 1843.
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| 17 | 1838 | - 4 Jul 1838: The Iowa Territory is established, and many settlers soon begin to arrive.
- 1 Sep 1838: William Clark dies in St. Louis, Missouri at age 68. In 1806, 1 year after the completion of the Lewis and Clark Expedition, Clark was appointed Governor of the Missouri Territory with a base in St. Louis. [He later lost an election to that post.] Clark greatly helped to smooth westward expansion by his skillful diplomacy with Indian tribes. He was eventually appointed Superintendent of Indian Affairs, a position he held until shortly before his death.
- 31 Dec 1838: Buchanan County, Missouri is formed with land from the Platte Purchase.
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| 18 | 1839 | - 27 Feb 1839: Lee County, Illinois is formed with land from Ogle County, Illinois.
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| 19 | 1840 | - 1840: United States population — 17,069,453.
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| 20 | 1841 | - 29 Jan 1841: Jasper County, Missouri is formed with land from Barry County, Missouri.
- 29 Jan 1841: Scotland County, Missouri is formed with land from Clark County, Lewis County and Shelby County, Missouri.
- 29 Jan 1841: Bates County, Missouri is formed with land from Van Buren County [later to be Cass County], Missouri.
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| 21 | 1842 | - 1842: John C. Frémont begins his first expedition to map the Oregon Trail at age 29. The expedition maps into Wyoming with its guide Christopher [“Kit”] Carson at age 32.
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| 22 | 1843 | - 1843: John C. Frémont completes the mapping of the Oregon Trail to the mouth of the Columbia River at the Pacific Ocean between what is now Washington and Oregon. Frémont is age 30.
- 16 Jan 1843: Rusk County, Republic of Texas is formed with land from Nacogdoches County, Republic of Texas.
- 17 Feb 1843: Appanoose County in the Iowa Territory is formed with land from Van Buren County and Davis County in the Iowa Territory.
- 4 Mar 1843: Larue County, Kentucky is formed with land from Hardin County, Kentucky.
- 26 Jul 1843: The plat of St. Joseph, Buchanan County, Missouri is recorded in St. Louis, Missouri.
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| 23 | 1844 | - 24 May 1844: Samuel Morse sends the message, "What hath God wrought!", launching the first telegraph line between Baltimore, Maryland and Washington, D.C. Morse is age 53.
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| 24 | 1845 | - 14 Feb 1845: Nodaway County, Missouri is formed with land from Andrew County, Missouri.
- 1 Mar 1845: Texas becomes the 28th state.
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| 25 | 1846 | - 25 Apr 1846: Navarro County, Texas is formed with land from Robertson County, Texas.
- 27 Apr 1846: Henderson County, Texas is formed with land from Houston County and Nacogdoches County, Texas.
- 27 Apr 1846: President James K. Polk breaks the treaty with Great Britain for the joint occupation of the Oregon Territory.
- 28 Dec 1846: Iowa becomes the 29th State.
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| 26 | 1847 | - 22 Jul 1847: The first Mormon emigrants arrive in Utah.
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| 27 | 1848 | - 24 Jan 1848: Gold is discovered in California.
- 2 Feb 1848: The Mexican War ends with the signing of the Treaty of Guadalupe Hildalgo. Mexico cedes California to the United States.
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1818 - 1848 (29 years)