Did the columbian exchange bring more changes to the americas or to europe

In 1914, alabama produced 1.7 million bales of cotton, but three years later produced only 515,000, bales. meanwhile, in georgia, 5.2 million acres of land was dedicated for cotton production in 1914, but by 1923 there were just 2.6 million acres used for growing cotton. all of this was the result of the work of a tiny insect: the boll weevil. alabama and georgia first felt the effects of the boll weevil at different times. what would account for this difference in timing?

Why can't producers offer a free good for sale?

Imagine that the value of the us dollar rises compared to the canadian dollar for many months. what effect is this likely to have on the amount of goods the us imports from canada?