Answer: B
Explanation: Cotton had become the most valuable crop of the South and comprised 59% of the exports from the United States during the Civil War.
The trail of tears was caused because the American settlers had been pressuring the federal government to remove Indians, mostly Cherokee and Chickasaw tribes, from the Southeast. Many settlers were settling on or around Indian lands, while others wanted more land to be available to European settlers. So, the correct answer would be A.
A patent is an exclusive right granted by country to allow the inventor to exclude others from making, using or selling their invention in that country during the life of the patent.
D all of the above because anything in an ecosystem adds to the biodiversity of it.
