テキサス併合
The Texas annexation and the border conflict after the annexation led to the Mexican–American War. As a result, the Constitution of 1824 was restored by interim President José Mariano Salas on 22 August 1846. In 1847, "The Reform Act" was published, which officially incorporated, with some changes, the Federal Constitution of 1824, to operate while the next constitution was drafted. This federalist phase culminated in 1853.