Why did Texas declare independence from Mexico in 1836 and why were many Americans reluctant to accept it as a new state in the Union?

Texas declared independence from Mexico in 1836 primarily due to cultural differences, grievances over Mexican laws, and a desire for self-governance among settlers, many of whom were American immigrants. Additionally, the issue of slavery played a significant role, as Texas was a slave-holding territory, which created tension with anti-slavery factions in the United States. Many Americans were reluctant to accept Texas as a state because its admission could exacerbate sectional conflicts over slavery and potentially lead to war with Mexico, which still claimed Texas as its territory.