Texas seceded in 1861 right after Lincoln was elected, and actually replaced governor Sam Houston because he refused to take an oath of allegiance to the confederacy. This automatically takes out D as a possibility.
Texas only abolished slavery with the 13th amendment, not on their own as a result of the things stated above
Texas did rewrite its constitution several times, but I think secession relates the most to the events given
Generally speaking, the French and Indian War settled the question of "<span>which country controlled the North American continent," since it was a war of British and French dominance in this region. </span>
