Republic of the Rio Grande
The Republic of the Rio Grande was an independent nation that insurgents against the Central Mexican Government sought to establish in northern Mexico. The rebellion lasted from January 17 to November 6, 1840 and the Republic of the Rio Grande was never officially recognised.



http://en.wikipedia.org/wiki/Republic_of_the_Rio_Grande
After a decade of strife, Mexico won its independence from the Kingdom of Spain in 1821. After a failed attempt at a monarchy, Mexico adopted a new constitution, the 1824 Constitution. This new constitution established los Estados Unidos Mexicanos, or "the United Mexican States," as a federal republic, similar to the United States.
In 1833, General Antonio López de Santa Anna was elected to his first term as president and was, at the time of his election, in support of the federal republic. However, after some members of government angered Santa Anna's political allies, Santa Anna decided to start a centralized government. Santa Anna suspended the constitution, disbanded Congress and made himself the center of power in Mexico. This led to the eruption of a number of uprisings and secessionist movements throughout the country, the most successful being the Texas Revolution. Less successful secession movements were attempted by the Republic of Zacatecas and the Republic of Yucatán. At the same time there was activity inside the country of fillibusters, which sought to expand slavery in Mexico. Many of the caudillos that initiated and participated in the rebellion also participated in later violent secessionist movements.
On January 17, 1840 a meeting was held at the Oreveña Ranch near Laredo.[1] A group of notables from the states of Coahuila, Nuevo León, and Tamaulipas advocated a rebellion seeking secession from Mexico and formation of their own federal republic with Laredo as the capital. However, those states' own congresses and governments never took any action to support the insurgents, and requested the help of the Central government in Mexico City to aid the local state armies.
The Republic of the Rio Grande was an independent nation that insurgents against the Central Mexican Government sought to establish in northern Mexico. The rebellion lasted from January 17 to November 6, 1840 and the Republic of the Rio Grande was never officially recognised.
http://en.wikipedia.org/wiki/Republic_of_the_Rio_Grande
After a decade of strife, Mexico won its independence from the Kingdom of Spain in 1821. After a failed attempt at a monarchy, Mexico adopted a new constitution, the 1824 Constitution. This new constitution established los Estados Unidos Mexicanos, or "the United Mexican States," as a federal republic, similar to the United States.
In 1833, General Antonio López de Santa Anna was elected to his first term as president and was, at the time of his election, in support of the federal republic. However, after some members of government angered Santa Anna's political allies, Santa Anna decided to start a centralized government. Santa Anna suspended the constitution, disbanded Congress and made himself the center of power in Mexico. This led to the eruption of a number of uprisings and secessionist movements throughout the country, the most successful being the Texas Revolution. Less successful secession movements were attempted by the Republic of Zacatecas and the Republic of Yucatán. At the same time there was activity inside the country of fillibusters, which sought to expand slavery in Mexico. Many of the caudillos that initiated and participated in the rebellion also participated in later violent secessionist movements.
On January 17, 1840 a meeting was held at the Oreveña Ranch near Laredo.[1] A group of notables from the states of Coahuila, Nuevo León, and Tamaulipas advocated a rebellion seeking secession from Mexico and formation of their own federal republic with Laredo as the capital. However, those states' own congresses and governments never took any action to support the insurgents, and requested the help of the Central government in Mexico City to aid the local state armies.