why was texas annexation in 1845 a turning point in texas and us history?

The annexation of Texas by the United States in 1845 was a significant turning point in both Texas and US history for several reasons:

1) Expansion of US territory: The annexation of Texas marked a major expansion of the United States' territory. Texas became the 28th state of the Union, increasing the size of the country and furthering its territorial ambitions. This expansion set a precedent for future territorial acquisitions and westward expansion.

2) Manifest Destiny: The annexation of Texas was a direct result of the concept of Manifest Destiny—the belief that it was the United States' destiny to expand its territory from coast to coast. The annexation of Texas was seen as a step towards fulfilling this vision and achieving continental dominance.

3) Tensions with Mexico: The annexation of Texas exacerbated tensions between the United States and Mexico, which ultimately led to the Mexican-American War (1846-1848). Mexico viewed the annexation as a violation of its territorial claims, resulting in the two nations engaging in armed conflict over the disputed territory.

4) Slavery and sectional conflict: The annexation of Texas intensified the already-existing debates over slavery in the United States. Texas was a slave-owning territory, and its admission as a state further deepened the divide between the southern states that advocated for slavery and the northern states that opposed it. These tensions ultimately culminated in the American Civil War, which had profound implications for the entire United States.

5) Border disputes: The annexation of Texas led to complex border disputes between the United States and Mexico. Mexico refused to accept the Rio Grande as the international border and claimed Texas as a rebellious province. The disputed border region eventually became a major catalyst for the Mexican-American War.

6) Texas identity and statehood: The annexation of Texas solidified the unique identity of the state within US history. Texas had previously been an independent republic, and its annexation represented a crucial step towards integrating Texas into the United States and establishing a sense of statehood.

Overall, the annexation of Texas in 1845 was a turning point in both Texas and US history due to its impact on territorial expansion, relations with Mexico, slavery, sectional conflict, border disputes, and the identity of Texas as a state.