The sequence of events you've provided relates to the historical context leading up to the Mexican-American War and the annexation of Texas. To give you a clearer picture, here is a brief overview of each event and how they are connected:
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Mexico Allows American Settlers into Texas (1820s-1830s): In the 1820s, Mexico encouraged American (primarily Anglo-American) settlers to move to Texas, which was then part of Mexico, in order to promote development and secure the territory. This led to a significant influx of settlers, who established several colonies.
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Texas Declares Independence (March 2, 1836): Tensions grew between the American settlers and the Mexican government over issues such as governance, slavery, and cultural differences. In 1836, after a series of skirmishes, Texas declared independence from Mexico, leading to the Texas Revolution. The famous Battle of the Alamo became a symbolic event during this struggle.
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The U.S. Annexes Texas (December 29, 1845): After gaining independence, Texas existed as a sovereign republic for nearly a decade. In 1845, the United States Congress voted to annex Texas, making it the 28th state of the U.S. This action was contentious and contributed to rising tensions between the U.S. and Mexico.
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The U.S. Declares War on Mexico (April 25, 1846): Following the annexation of Texas, the U.S. and Mexico had disputes over the border; the U.S. claimed the Rio Grande as the border, while Mexico claimed the Nueces River. These tensions escalated, and after a skirmish between U.S. troops and Mexican forces, President James K. Polk declared war on Mexico, leading to the Mexican-American War (1846-1848).
These events collectively highlight the complex historical relationship between the United States and Mexico during the 19th century, marked by territorial expansion, conflict, and significant changes in national boundaries.