The U.S. annexed Texas for several reasons, including:
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Manifest Destiny: Many Americans believed it was their destiny to expand across the continent, which included the acquisition of Texas.
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Economic Interests: Texas had fertile land and significant resources that were attractive for agriculture and trade.
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Security Concerns: Annexing Texas was seen as a way to secure the southern and western borders of the United States against potential threats from Mexico.
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Political Factors: The addition of Texas as a slave state was appealing to Southern politicians who wanted to maintain a balance of power between free and slave states in Congress.
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Support for American Settlers: The U.S. wanted to support American settlers already living in Texas, many of whom were seeking greater political autonomy from Mexico.
All of these factors, among others, contributed to the decision to annex Texas in 1845.