20 июня 1793 года американец Эли Уитни запатентовал хлопкоочистительную машину

Whitney's invention pushed forward the agriculture in the United States, but at the same time slowed down the abolition of slavery. Cotton has become a profitable crop, and it took a lot of working hands to process it. It took the US a president with strong political will and a civil war to abolish slavery.