February 2 - 1848 - The Treaty of Guadalupe Hidalgo

The Treaty of Guadalupe Hidalgo officially ended hostilities in the Mexican-American War, although the United States of America had effectively ended the war by taking over much of Mexico. This meant that the terms of the Treaty were largely America's and had to be accepted by Mexico. The war began in 1846 as a border dispute around the newly annexed Republic of Texas, but after America sent troops to the disputed area, they invaded Mexico. With astonishing speed, the northern areas of Mexico were taken over by America, with California seeing a revolt by American settlers. Eventually, an Army under General Winfield Scott would march from Veracruz on the coast to Mexico City, easily taking over the capital. As a result, Mexico lost most of its northern territory to the United States, and faced many more political issues at home. America was further placed on the path towards Civil War and disunion. 

William Floyd