|   [[1790s]]  |   [[1800s]]  |   [[1810s]]  |     [[1820s]]  |     [[1830s]]  |     1840s  |     [[1850s]]  |     [[1860s]]  |     [[1870s]]  |     [[1880s]]  |     [[1890s]]  | [[1900-2000]]|
====== 1840's ======
|  * [[1840]]  |    * [[1841]]  |    * [[1842]]  |    * [[1843]]  |    * [[1844]]  |  * [[1845]]  |    * [[1846]]  |    * [[1847]]  |    * [[1848]]  |    * [[1849]]  |

===== Events =====
==== Boone County ====
  * 1840 - The [[towns|town]] of [[Walton]] is established.
  * 1840 - Boone County's [[slavery|enslaved]] population reaches its peak at 21.8% of the total population. 
  * 1842 - The Boone Academy is renamed the [[Morgan Academy]].
  * 1843 - [[Big Bone Baptist Church]] is established.
  * 1847 - John P. Gaines becomes the first Boone County native elected to the U.S. Congress.

==== Kentucky ====
  * 1840 - Kenton County is created from Campbell County.
  * 1845 - Cassius Clay begins his anti-slavery newspaper, //The True American//.

==== U.S. & World ====
  * 1841 - President William Henry Harrison dies after one month in office, and is succeeded by Vice President John Tyler.
  * 1845 - Potato crops fail throughout Europe. Approximately two million people will die in the resulting famine. The famine is especially hard in Ireland where potatoes are a major food crop, resulting in a wave of Irish immigration. 
  * 1846 - Failing in his attempt to purchase the New Mexico territory from Mexico, President James Polk orders Zachary Taylor to advance to the Rio Grande. Congress declares War on Mexico.
  * 1848 - The Treaty of Guadalupe Hidalgo ends the Mexican War. Mexico gives up California and all land north of the Rio Grande, which makes up 35% of Mexico's total territory.
  * 1849 - [[John Uri Lloyd]] is born.
  * 1849 - Kentucky native and Mexican War hero Zachary Taylor is inaugurated President.