Based on the information provided in the map regarding free and slave states, the main reasons Congress initially refused to annex Texas that are supported by this information are:
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If the United States annexed Texas, it would almost certainly mean war with Mexico.
- This is a likely concern given the contentious relationship between the U.S. and Mexico regarding Texas.
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If the United States annexed Texas, it would enter as a free state and anger Southerners.
- Though this might not be entirely accurate since Texas was a slave-holding territory, it reflects concerns about the balance of free and slave states.
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If the United States annexed Texas, slave states would almost certainly outnumber free states.
- This point is particularly relevant, as adding Texas as a slave state would contribute to an imbalance favoring slave states.
The option about jeopardizing claims in California is not directly supported by the information about free and slave states provided in the map. Therefore, the first three options would be the most relevant responses.