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slavery
annexation
Generally speaking, Southerners supported the annexation, while Northerners had fears. The main issue involved was slavery. Texas was annexed in 1845.
When Texas gained independence from Mexico, it fiercely fought to protect and guarantee its slavery rights. While Texas remained its own independent nation as the Republic of Texas, little notable attention from the United States was given to the newborn country with regards to the slavery issue. However, once the Union began discussions on the possible annexation of Texas, the slavery issue burst through once the free states realized that Texas' annexation would upset the balance of free and slave states representation.
fear that it would lead to war
The annexation of Texas was the main issue of the election of 1844.
Because Texas is an abnormally large state? I don't know?
Texas sought annexation by the United States.
Yes - specifically about the annexation of Texas.
fear that it would lead to war
It was one of the nations that immediately recognized the Republic of Texas as an independent country.
Texas practiced slavery, and the US already had adequate problems maintaing a balance between the north and the south on that issue. Texas had made an effort to go it alone as a Republic, but it lacked recognition by most of the world and had created an enormous burden of debt. Texas needed a handout in a big way.