With a clash between two armies in the Neuces Strip called the Thornton Affair on 25 February 1846,
The Mexican-American War
Inside the contested Neuces Strip.
Dolores near Guanajuato.
The biggest conflicts involving the United States in the 19th century were the War of 1812, the Mexican-American War, and the Civil War.
War with Great Britain, Missouri Compromise, Monroe Doctrine, Mexican-American War
Congress declared War on 13 May 1846 after the Thornton Affair.
Texas became an official state of the United States of America.
The War of 1812The Mexican-American WarThe American Civil WarThe Spanish American War
There were several wars fought in the U.S. in the 1800's. Some include the War of 1812, Black Hawk War, and the Civil War.
in the 1800s
The conflict which nowadays is known as the Mexican War of Independence against Spain started on the early hours of September 16, 1810. It ended on September 27, 1821.