The Second Federal Republic of Mexico (Spanish: Segunda República Federal de México) is the name given to the second attempt to achieve a federalist government in Mexico after a period of centralism. Officially called the United Mexican States (Estados Unidos Mexicanos), a federal republic was established again on August 22, 1846 when interim president José Mariano Salas issued a decree restoring the 1824 constitution. The Second Republic continued to be rocked by the political instability that had characterized Mexico since independence. Mexico's loss in the war with the United States during this time saw half of Mexican territory become part of the United States.