Answer: the invention of cotton gin
Explanation:The cotton gin refers to a a machine that sets aside cotton fibers from their seeds. Therefore, the invention of the cotton gin transformed the cotton industry in the United States and demanded cheap labor force, which led to the rise of slavery in the South and to the American Civil War later.
(Also known as the South African War) between the British and the Boers was the first modern ''total'' war. The Boars were Dutch farmers with European ancestry who gradually settled in Africa many years before other Europeans and were considered Africans.
