The Spanish Colonial Legacy and Mexican Independence For centuries, the lands that would become the US-Mexico border were administered as part of New Spain, a massive viceroyalty centered in Mexico City. The individuals who were Mexican citizens living in the ceded territories became US citizens overnight, often facing challenges in maintaining their land titles and cultural practices.
The Decision Behind Annexation: Texas and the War of 1845
This final adjustment of the border completed the modern geography of the United States in the Southwest, securing the current route of the Southern Pacific Railway and establishing the border line that remains in place today between the US and Mexico. Consequently, the history of "what states were part of Mexico" is not merely a historical footnote; it is a living narrative that informs contemporary discussions on identity, language, and cross-border relations in the American Southwest.
The story involves a vast region of North America that was unified under Spanish colonial rule and later governed as independent Mexico before the dramatic shifts of the nineteenth century. Following the Mexican War of Independence, which concluded in 1821, these territories transitioned into the newly formed United Mexican States.
The Decision Behind the Annexation of Texas and the War with Mexico
These systems established patterns of land ownership and settlement that persisted long after the political boundaries changed, creating a lasting imprint on the cultural and legal landscape of the American West. This transfer encompassed the entirety of what are now the states of California, Nevada, and Utah, along with significant portions of Arizona, New Mexico, Colorado, and Wyoming.
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