How did african americans contribute to the us during the time of slavery

Why hadn’t europeans used maritime routes before the age of exploration?

What did kublai khan learn from the chinese advisers he consulted?

President clinton, on the fortieth anniversary of the events in arkansas surrounding the "little rock nine," stated that "when the constitutional rights of our citizens are threatened, the national government must guarantee them." this principle was the basis for using federal authority in: the expansion of voting rights to women. the passage of the civil rights act of 1964. the passage of the americans with disabilities act. all of the choices.