Explain why in the controversy over the annexation of Texas, “the issu

Explain why in the controversy over the annexation of Texas, “the issue was not Texas but slavery.” Tell how both pro- and anti-annexationists used the slavery question as a part of their argument.

What will be an ideal response?

ANSWER
Consider:
Pro: Antislavery Britain would grab Texas if the United States didn’t, then use it as a haven for runaway slaves from the United States. Also, Texas could be a new slave state (or states) to maintain southern power in the Union.
Anti: A proslavery Texas would upset the balance of power in the Senate and open the door to the further expansion of slavery.