1- The correct answer is B. Right before Texas seceded from the Union, Lincoln became President of the United States.
In 1860, following the election of President Abraham Lincoln (in favor of the abolition of slavery), the public opinion of the deep south of the United States was more oriented towards secession. In February 1st, 1861, the State of Texas declared its secession from the Union.
2- The correct answer is D. In March of 1861, Texas joined the Confederation and, when the Civil War started in April of the same year, the Texan forces begun to fight in the Confederate Army's lines.
3- The correct answer is C. The Texas' main reason for secession was to protect slavery in its territory, due to the fact that slaves were more than 30% of the state's population, and they were by far the major labor force that keept Texan production ongoing during that time.
