As a result of the Mexican American War the Northern, Southern and Western Texas borders were all redrawn.
The map of Texas was redrawn after the Treaty of Guadalupe Hidalgo.
Nowadays? No. However, these issues over Texas' border prompted a war between both countries, known as the Mexican-American War (1846-1848).
It began in Texas.
The Mexican-American War was about which country owns Texas.
Yes, it resulted in the Mexican Cession and the Treaty of Guadalupe Hidalgo.
Texas
The Mexican government and the American settlers clashed over numerous issues, however, allegiance to Spain was not one of them. Slavery is an example of an issue they did clash over.
The Mexican-American War began
Texas
texas
The independence of the Texas RepublicThe Mexican-American WarUltimately, the American Civil War
The war solidified the southern boundary of Texas and ended the hopes of Mexico for getting it back.