Free African American communities during the antebellum period showed the rest of Americans that African Americans could perfectly be as prosperous, self-reliant and educated as white Americans. They provided a showcase of what educated African Americans could accomplish and demonstrated that if they were given the same means and opportunities that white Americans enjoyed, they could perfectly enjoy the same level of prosperity of educated white Americans. The emergence of an active and extremely articulate black leadership showed the rest of Americans that the only thing that separated free, educated African Americans in the 19th from their white counterparts was the color of skin. Furthermore, not only intelligent African American leaders who were born free achieved a great level of education and influence, some of the leaders of the black community had been born into slavery and after escaping had managed to educate themselves and even surpass several white Americans in terms of intellectual accomplishments. Frederick Douglass is an excellent example of this. Despite being born into slavery and remaining in this condition until the age of 16, he secretly educated himself and escaped to become one of the most powerful and eloquent orator of the abolitionist movement.
U.S. Entry into World War I, 1917. ... Wilson cited Germany's violation of its pledge to suspend unrestricted submarine warfare in the North Atlantic and the Mediterranean, as well as its attempts to entice Mexico into an alliance against the United States, as his reasons for declaring war.
If I were to give a very general answer, this is the concept of imperialism/expansionism. Humans seek to improve themselves by nature i.e. rich people want to become richer. In the same way, Japan (and actually any powerful country) would want to expand and colonise/seize other countries to improve their global standing and become more powerful. (Imagine if Japan seized every country - we would be under their control! - just a thought haha)
The answer is D.
This is because the Americas were looking for extra help they didn't want to have to pay for and thought that the Africans were experienced in farming and were strong. They would have chosen the Indian-Americans (that should be referred to as Native Americans), but because of the sicknesses, that did not happen.
