The United States annexed Texas for several reasons, including:
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Manifest Destiny: There was a widespread belief in the 19th century that the U.S. was destined to expand its territory across North America. Many Americans viewed the annexation of Texas as a natural step in fulfilling this destiny.
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Economic Interests: Texas had fertile land suitable for agriculture, particularly cotton, which was important for the Southern economy. The potential for economic growth made annexing Texas appealing.
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Security Concerns: The U.S. wanted to prevent European powers, particularly Britain and France, from gaining influence in Texas and potentially threatening U.S. borders.
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Political Factors: The annexation was supported by southern politicians who viewed it as a way to increase the number of slave states, which would balance the political power between free and slave states in Congress.
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Increasing Tensions: After Texas won independence from Mexico in 1836, maintaining its independence was an issue. Annexation would help stabilize the region in light of ongoing conflicts with Mexico.
These factors combined to create a strong impetus for the United States to annex Texas in 1845.