Based on the information provided, the main reason Congress initially refused to annex Texas that is supported by the map would be:
- If the United States annexed Texas, it would almost certainly mean war with Mexico.
This reason highlights the geopolitical tension with Mexico regarding Texas, which was then a disputed territory.
The other options may not be as directly supported by the content of the map regarding Texas and its annexation:
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If the United States annexed Texas, it would enter as a free state and anger Southerners. → This option assumes Texas would enter as a free state, which was not the case, as Texas was a slave state.
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If the United States annexed Texas, slave states would almost certainly outnumber free states. → While this concern was relevant, it would depend on additional context regarding the balance of power.
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If the United States annexed Texas, it would jeopardize the country’s other claims in California. → This statement may not be directly supported by the information about Texas.
Based on the reasoning and the specifics of the situation, the first statement is the most relevant and supported by historical context regarding the annexation of Texas.