The most accurate statement regarding slavery in Texas is:
The number of slaves in Texas increased in the years before the Civil War.
This reflects the growth of the plantation economy and the demand for labor in Texas as it became a more significant cotton-producing region. The other statements are not accurate in the context of the historical reality of slavery in Texas. Most white Texans did not own slaves; while slavery was integral to the economy, it would be misleading to state that it played a minor role; and former slaves did not enjoy full citizenship rights immediately after slavery was abolished.