Several factors led to the annexation of Texas:
* Economic reasons: Texas had significant cotton and agricultural potential. Annexation would give the United States access to these resources and expand the economic power of the Southern states.
* Geopolitical reasons: Annexation would secure the southern border of the United States and ensure control of the lands between Texas and the Gulf of Mexico.
* Social and cultural factors: Many Texans were of American descent and felt a strong connection to the United States. They desired to be part of the Union and to expand the institution of slavery.
* Political reasons: The annexation debate became a major issue in American politics. President James K. Polk, who had campaigned on the promise of acquiring Texas, played a significant role in driving the annexation process forward.