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In page Monterrey:

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In the 19th century, after the Mexican Independence War, Monterrey rose as a key economic center for the newly formed nation, especially due to its balanced ties between Europe (with its connections to Tampico), the United States (with its connections to San Antonio), and the capital (through Saltillo). In 1824, the "New Kingdom of León" became the State of Nuevo León, and Monterrey was selected as its capital. But the political instability that followed the first 50 years of the new country allowed two American invasions and an internal secession war, during which the governor of the state annexed Coahuila and Tamaulipas states, designating Monterrey as the capital of the Republic of the Sierra Madre as it did before in 1840 for the Republic of the Rio Grande.[citation needed]