Answer:
Clay believed accepting Texas as a state would another slave state to the United States.
Step-by-step explanation:
During this time period in which slavery was legal, the US government enacted a law (search it up, can’t remember it) that had to make the amount of slave and free states equal. Almost all southern states were slave states and wanted to ensure the northern states against slavery would not help pass laws against the slave trade and slavery itself. You can talk about how this conflict would be a major reason for why the Civil War broke out.