Why did Mexico consider Texas as a stolen state?

Mexico considered Texas a stolen state due to the 1836 Texas Revolution, where Texan settlers, many of whom were American immigrants, declared independence from Mexico. The subsequent annexation of Texas by the United States in 1845 was viewed by Mexico as a violation of its sovereignty, leading to heightened tensions. The situation escalated into the Mexican-American War (1846-1848), resulting in Mexico losing a significant portion of its territory, which Mexicans still regard as an unjust seizure of land.