2. what method did the union use to stop most of the south's cotton trade? a. a large naval blockade b. poisoning of cotton plants c. the production of its own cotton to put the south out of business d. a road blockade stopping cotton caravans to mexico

I believe it was a large naval blockade. Since the South had high import/export rates, it funded the war. The Union decided to take control of the Mississippi River and after gaining New Orleans and Baton Rouge, they blockaded all of the Confederate supplies coming in from other nations, forcing them into submission.

The answer to this question is A: A large naval blockade