Answer:
Textiles and lumber
Step-by-step explanation:
Cotton was the most important part of the economy of the South, it was also the most valuable export material of the United States. Cotton is the part of the textile industry, and it was one of the largest industries in the world, therefore the answer is 1.
Industries also used lumber as raw material, because it could be exported and after "cleaning" forests new opening for planting cotton would appear.