Congress of the Union in the context of "Provisional Government of Mexico"

The Supreme Executive Power (Spanish: Supremo Poder Ejecutivo) was the provisional government of Mexico that governed between the fall of the First Mexican Empire in March 1823 and the election of the first Mexican president, Guadalupe Victoria, in October 1824. After Emperor Agustín abdicated, the sovereignty of the nation passed over to Congress, which appointed a triumvirate, made up of Guadalupe Victoria, Pedro Celestino Negrete, and Nicolas Bravo, to serve as the executive, while a new constitution was being written.

During this period the government oversaw the transition of the nation from monarchy to a republic, abolishing all titles of nobility, changing the national symbols, and removing from power the remnants of the imperial government. Iturbide himself and his family were exiled to Europe, and when he attempted to return in July 1824, he was captured and executed.

The politics of Mexico function within the framework of the federal presidential representative democratic republic whose government is based on a multi-party congressional system, where the President of Mexico is both head of state and head of government. The federal government represents the United Mexican States. It is divided into three branches: executive, legislative, and judicial, established by the Political Constitution of the United Mexican States, published in 1917. The constituent states of the federation must also have a republican government based on a congressional system established by their respective constitutions.

Executive power is exercised by the executive branch, headed by the President, who is advised by a cabinet of secretaries independent of the legislature. Legislative power is vested in the Congress of the Union, a two-chamber legislature comprising the Senate of the Republic and the Chamber of Deputies. Judicial power is exercised by the judiciary, consisting of the Supreme Court of Justice of the Nation, the Council of the Federal Judiciary, and the collegiate, unitary, and district tribunals.

The Gadsden Purchase (Spanish: Venta de La Mesilla "La Mesilla sale") is a 29,640-square-mile (76,800 km) region of present-day southern Arizona and southwestern New Mexico that the United States acquired from Mexico by the Treaty of Mesilla, which took effect on June 8, 1854. The purchase included lands south of the Gila River and west of the Rio Grande where the United States wanted the construction of what is now known as the Sunset Route, a transcontinental railroad, to be carried out, which the Southern Pacific Railroad later completed in 1881–1883. This allowed for the railroad's construction to be shorter, easier, and straighter. Without said purchase, the railroad's expansion would have taken longer and been more expensive. The purchase also aimed to resolve other border issues.

The first draft was signed on December 30, 1853, by James Gadsden, U.S. Minister to Mexico, and by Antonio López de Santa Anna, president of Mexico. The U.S. Senate voted in favor of ratifying it with amendments on April 25, 1854, and then sent it to President Franklin Pierce. Mexico's government and its General Congress or Congress of the Union took final approval action on June 8, 1854, when the treaty took effect. The purchase was the last substantial territorial acquisition in the contiguous United States, and defined the Mexico–United States border. The Arizona cities of Tucson, Yuma and Tombstone are on territory acquired by the U.S. in the Gadsden Purchase.

Fort Velasco was a small circular palisade fort built by a garrison of Mexican soldiers at (what would become known as) Velasco, Texas at the present-day location of Surfside Beach on the northeast bank at the mouth of the Brazos River and Texas Gulf Coast. The name also applies to at least three other forts built at almost the same location, one during the Texas Revolution, and two during the Civil War.

In response to fear of annexation of Texas by the United States during the era of Mexican Texas, the Mexican Congress passed the Law of April 6, 1830, which halted legal immigration by Americans and established military occupation. Initially, sporadic efforts were made to establish a customs post at this location in 1830 and then again in 1831, but these efforts were less than successful. As a result, "Fortaleza de Velasco" was erected in April to May 1832 by the order of General Terán to enforce the customs and immigration provisions of the new law for the customs port of entry.

The Senate of the Republic (Spanish: Senado de la República), constitutionally the Chamber of Senators of the Honorable Congress of the Union (Spanish: Cámara de Senadores del H. Congreso de la Unión), is the upper house of Mexico's bicameral Congress. It currently consists of 128 members, who serve six-year terms.

The Chamber of Deputies (Spanish: Cámara de Diputados, pronounced [ˈkamaɾa ðe ðipuˈtaðos]), constitutionally the Chamber of Deputies of the Honorable Congress of the Union (Spanish: Cámara de Diputados del H. Congreso de la Unión), is the lower house of the Congress of the Union, the bicameral parliament of Mexico. The other chamber is the Senate. The structure and responsibilities of both chambers of Congress are defined in Articles 50 to 70 of the Constitution.