Lincoln in his late 30s – photo taken by one of Lincoln's law students around 1846

* 1846 – The Second Federal Republic of Mexico is established.

* 1846 – Anna Haining Bates, Canadian giant ( d. 1888 )

* Haliotis alfredensis Reeve, 1846-the Alfred's abalone – synonym: Haliotis speciosa Reeve, 1846, the splendid abalone

* Haliotis coccoradiata Reeve, 1846 – the reddish-rayed abalone

* Haliotis discus Reeve, 1846 – the disk abalone

** Haliotis diversicolor squamata Reeve, 1846 – synonym: Haliotis squamata – the scaly Australian abalone

* Haliotis jacnensis Reeve, 1846 – the Jacna abalone

* Haliotis rubiginosa Reeve, 1846 – synonym: Haliotis howensis, the Lord Howe abalone

Alcott's opposition to slavery also fueled his opposition to the Mexican – American War which began in 1846.

* 1846 – Charles Woodruff, American archer ( d. 1927 )

* 1846 – Luis Martín, Spanish religious leader ( d. 1906 )

* 1846 – Alexander Milne Calder, American sculptor ( d. 1923 )

* 1846 – The Donner Party of pioneers departs Springfield, Illinois, for California, on what will become a year-long journey of hardship, cannibalism, and survival.

* John Pryor, 1846 – 1850

* 1846 – The Smithsonian Institution is chartered by the United States Congress after James Smithson donates $ 500, 000.

* 1904 – Pierre Waldeck-Rousseau, French politician, 68th Prime Minister of France ( b. 1846 )

He married fourthly at the Dolmabahçe Palace, Constantinople, on 21 September 1866 to Georgian HH Hayranidil Kadın Efendi ( Kars, 2 November 1846 – Ortaköy Palace, Constantinople, 26 November 1898 ), and had two children.

* 1846 – Thornton Affair: Open conflict begins over the disputed border of Texas, triggering the Mexican-American War.

* 1763 – Domenico Dragonetti, Italian double bass virtuoso and composer ( d. 1846 )

In 1899, the memorial, by the Berlin sculptor Ernst Gustav Herter ( 1846 – 1917 ), finally came to rest, although subject to repeated vandalism, in the Bronx, at 164th Street and the Grand Concourse, or Joyce Kilmer Park near today's Yankee Stadium.

Lord George Bentinck, Conservative leader in the commons 1846 – 48

* Pope Gregory XVI ( 1765 – 1846, r. 1831 – 46 )

Doubleday initially served in coastal garrisons and then in the Mexican-American War from 1846 to 1848 and the Seminole Wars from 1856 to 1858.

The Batallón de San Patricio, a battalion of U. S. troops who deserted and fought alongside the Mexican Army against the United States in the Mexican-American War of 1846 to 1848, is also famous in Mexican history.

In 1846 the Mexican-American War began.

Carson was a courier and scout during the Mexican-American war from 1846 to 1848, celebrated for his rescue mission after the Battle of San Pasqual and his coast-to-coast journey from California to deliver news of the war to the U. S. government in Washington, D. C ..

San Pasqual Battlefield State Historic Park, located near Escondido, California, is a California State Park which honors the memory of the participants from both the United States and Mexico, including Kit Carson, who contested the Battle of San Pasqual on December 5 – 6, 1846 during the Mexican-American War.

* 1846 – President James K. Polk asked for and received a Declaration of War against Mexico, starting the Mexican-American War

* 1846 – Mexican-American War: President Mariano Paredes of Mexico unofficially declares war on the United States.

* 1846 – Mexican-American War: The United States declares war on Mexico.

* 1846 – Mexican-American War: Siege of Fort Texas.

Following the Mexican-American War, from 1846 – 1848 and the Treaty of Guadalupe Hidalgo in 1848, Mexico ceded its mostly unsettled northern holdings, today known as the American Southwest and California, to the United States of America.

* Mexican-American War ( 1846 – 1848 ) was fought between Mexico and the United States of America.

US forces took over California in 1846, which came under formal United States control in 1848 with the Treaty of Guadalupe Hidalgo at the conclusion of the Mexican-American War.

The war between Texas and Mexico did not truly come to an end until the Mexican-American War of 1846.

In 1846, the earliest large-scale engagement of the Mexican-American War took place in the city, known as the Battle of Monterrey.

In 1846 at the start of the Mexican-American War, Wallace was studying law.

The Compromise of 1850 was a package of five bills, passed in September 1850, which defused a four-year confrontation between the slave states of the South and the free states of the North regarding the status of territories acquired during the Mexican-American War ( 1846 – 1848 ).

The US annexation of Texas led to the Mexican-American War ( 1846 – 1848 ) ( in which his namesake son died ).

The U. S. Army under Stephen Kearny occupied the territory in 1846 during the Mexican-American War and Mexico recognized its loss to the United States in 1848 with the Mexican Cession in the Treaty of Guadalupe Hidalgo.

The Saint Patrick's Battalion (), formed and led by Jon Riley, was a unit of 175 to several hundred immigrants ( accounts vary ) and expatriates of European descent who fought as part of the Mexican Army against the United States in the Mexican-American War of 1846 to 1848.

He disapproved of the Mexican-American War in 1846, although he came to believe that the outcome would be beneficial to both countries.

) When Polk moved to terminate the joint occupation agreement, the British finally agreed to divide the region along the 49th parallel in early 1846, keeping the lower Columbia basin as part of the United States, and the dispute was settled by the Oregon Treaty of 1846, which the administration was able to sell to congress because the United States was about to begin the Mexican-American war, and the president and others argued it would be foolish to also fight the British Empire.

In late 1846 Frémont, acting under orders from Commodore Robert F. Stockton, led a military expedition of 300 men to capture Santa Barbara, California, during the Mexican-American War.