List some factors that influenced Texans to be either pro-secession or Pro-Union.

Texas became the seventh states to join confederacy

Explanation:

Texans joined the confederate states because people who had most influence in the state were slave owners and they desired to keep their slaves. sectionalism, high tariff were the resins for secession of Texas and joined the confederacy.  confederacy proved to much stronger in military power and Texas built a strong military support by joining the confederacy.

Texans realized that if they decided to be an independent state, their economy and commerce would be severely cornered and their relationship with neighboring nations would also minimize. By Joining the Confederacy, Texas believed that it helped to ensure interstate trade and commerce to remain stable.

the answer is a) the proclamation of 1763.