Both of these leaders had fairly effective strategies when it came to alleviating some of the racial woes during this time. DuBois, however, took a slightly different path in that he emphasized education of blacks as being the most important factor in their advancement.
The correct answer should be the decline of the manufacturing industry. Factories and manufacturing plants started closing down since the companies could earn a lot more if they outsourced businesses and factories to foreign countries. They would pay foreign workers way less salaries than they would pay American workers so the manufacturing plants started closing down and entire cities started getting deindustrialized.
It was neil armstorng that said it
The American Revolution was principally caused by colonial opposition to British attempts to impose greater control over the colonies and to make them repay the crown for its defense of them during the French and Indian War (1754–63)