Why did W. E.B. Du Bois and other black intellectuals challenge Washington's leadership?

He u.s. constitution (1787) establishes a national legislature with powers to “create national law”, a national executive with the power to “enforce national law”, and a national judiciary branch with the power to “interpret national and state policies” to see whether or not they violate the national constitution. this term describes the division of governmental authority into semi-independent bodies?

Why are nation-states difficult to create?

Word does jefferson use in opening of the second paragraph that means "obvious? "