I believe it would be globalization.
It is letter C because plantations were farms that encouraged slavery
I believe the answer would be D.) since it formed because of how poor the conditions of the migrant workers worked in were
Explanation:
Texas in the Civil War (PDF): Texas was a prominent state in the Civil War for several reasons. Texas was a part of the Confederacy. Fighting on the Fringe: The Civil War in Texas: Because Texas was deeply connected with the South, most Texans agreed that slavery was an important part of their economic stability.