It grew out of unresolved border disputes between the Republic of Texas and Mexico after the annexation of the former by the United States during the Texas Revolution of 1836 .
The Mexican -- American War lasted from 1846 until 1848 .
Mexican -- American War grew out of unresolved border disputes between the Republic of Texas and Mexico after the annexation of the former by the United States during the Texas Revolution of 1836 .
The Mexican -- American War lasted from 1846 until 1848 .