How did the annexation of Texas help contribute to the Civil War? The issue of admitting Texas as a slave state contributed to the conflict that caused the Civil War.
Texans had nothing in common with U. S. citizens. The cultural differences made annexation difficult.
Adding Texas as a state created an imbalance between southern and northern territories in terms of size.
Texas was predominately Catholic, while the rest of America was Protestant. Adding Texas created religious conflict.