The major factor that delayed Texas annexation until 1845 was:

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Quizplus · Accepted Answer

The major concern and delay in Texas annexation was the issue of whether Texas would enter the Union as a slave state, which caused opposition from anti-slavery activists in the US Congress. The fear of a possible Mexican attack on the United States was not a major factor in delaying annexation, as the US military was much stronger than Mexico's. Calhoun's incompetence as secretary of state was not a factor in delaying Texas annexation. While some Texans initially desired to remain an independent republic, they eventually began to push for annexation. While Britain did offer some support for Texas independence, it did not play a major role in delaying annexation.

The Major Factor That Delayed Texas Annexation Until 1845 Was