It mostly about the citizenship of mexican people where the land is acquired.
At that time, united states wanted Mexican citizens in the acquired land to became a part of American citizens and counted as their workforce. Mexican government believe that they are still Mexican citizens regardless of the ownership of the land. This political conflict lead to the U.S. Mexican war
One main reason is that they found cotton very profitable and depended on it because they don't want industry for the nation. The second one would be the big population that they had to sell people as slaves and also depended on this one. Lastly, the market for manufactured good were pretty small and the south that is mostly made up of slaves got no money for it.
I'd assume that the answer is Career Fair from past experience. I hope this helps!
Hati is the answer I hope this helps, be sure to answer correctly