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| Century | 1700's | 1800's | 1900's | 2000's | ||||||||
| Decade | 1800's | 1810's | 1820's | 1830's | 1840's | 1850's | 1860's | 1870's | 1880's | 1890's | ||
| Year | 1840 | 1841 | 1842 | 1843 | 1844 | 1845 | 1846 | 1847 | 1848 | 1849 | ||
| March 11, 1846 | U. S. troops move into disputed land between Nueces and Rio Grande Rivers | Texas |
| Mexican American War | ||
| March 28, 1846 | U. S. troops reach the Rio Grande | Texas |
| April 7, 1846 | John Slidell informs James Polk that the Mexican government has refused to recognize him as ambassador. | |
| James Polk | ||
| April 23, 1846 | Congress authorizes the termination of the agreement with Great Britain on the Oregon Territory. | Oregon |
| April 25, 1846 | United States troops, sent to the disputed portion of the Texas border to provoke an incident, are attacked by Mexican troops, precipitating the Mexican-American War | Texas |
| Mexican American War | ||
| William Hardee | ||
| May 8, 1846 | Zachary Taylor wins the battle of Palo Alto | |
| Mexican American War | ||
| Zachary Taylor | ||
| May 9, 1846 | Zachary Taylor wins the battle of Resaca de la Palma | |
| Mexican American War | ||
| Zachary Taylor | ||
| May 11, 1846 | James Polk informs Congress about Mexican agression in territory claimed by both the United States and Mexico | Texas |
| James Polk | ||
| Mexican American War | ||
| May 13, 1846 | United States declares war on Mexico | |
| Mexican American War | ||
| May 23, 1846 | Mexico declares war against the United States | |
| Mexican American War | ||
| June 15, 1846 | The Treaty of Washington (Oregon Treaty) is signed | Oregon |
| June 26, 1846 | Dragoons and volunteers leave Fort Leavenworth and head west to reinforce California and seize San Diego and Los Angeles. They return from a successful mission in August, 1847 | Kansas |
| Mexican American War | ||
| July 1, 1846 | Graduating from West Point (rank): George B. McClellan (2), John Gray Foster (4), Jesse Lee Reno (8), Darius Nash Couch (13) Thomas Jonathan Jackson later Stonewall Jackson(17), Truman Seymour (19), Charles Champion Gilbert (21), John Adams (25), Samuel Davis Sturgis (32), George Stoneman (33), William Duncan Smith (35) Dabney Herndon Maury (37), Innis Newton Palmer (38), David Rumph Jones (41), Alfred Gibbs (42), George Henry Gordon (43), Cadmus Marcellus Wilcox (54), William Montgomery Gardner (55), Samuel Bell Maxey (58), George Edward Pickett (59) | |
| George McClellan | ||
| Darius Couch | ||
| Stonewall Jackson | ||
| George Stoneman | ||
| July 30, 1846 | Walker Tariff (Tariff of 1846) is signed into law by President James Polk. It replaces tariffs on specific goods with an ad valorum tariff | |
| James Polk | ||
| August 6, 1846 | Second Independent Treasury Act signed into law by James Polk | |
| James Polk | ||
| August 8, 1846 | U. S. President James Polk requests 2 million dollars to purchase land from Mexico following the Mexican-American War. David Wilmot of Pennsylvania attaches the "Wilmot Proviso" to this bill. It passes in the House but is tabled in the Senate. | Pennsylvania |
| Wilmot Proviso | ||
| Wilmot Proviso [full text] | ||
| Causes of the Civil War | ||
| James Polk | ||
| John A. McClernand | ||
| Stephen A. Douglas | ||
| August 19, 1846 | Zachary Taylor begins a move toward Monterrey | |
| Mexican American War | ||
| Zachary Taylor | ||
| September 21, 1846 September 23, 1846 |
Battle of Monterrey, Mexico | |
| Mexican American War | ||
| Zachary Taylor | ||
| George Thomas | ||
| December 28, 1846 | Iowa is admitted as a free state. It is the 29th state and the slave-free balance in the Senate is 15-14. | Iowa |
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