What two issues contributed to the rejection of the Texas annexation treaty by the US Senate

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Explanation:

The main reason for this was slavery. The US did not want to annex Texas because doing so would have upset the balance between slave states and free states that had been accomplished with the Missouri Compromise of 1820. When Texas became independent, it wanted to join up with the United States.

either b) they were often feared and despised by other native cultures. or

c) their obsession allowed them to coexist with many other native cultures because of their peaceful nature.

the answer is true sir