Identify Continuity and Change

Why did the us government remove native americans from the southeast in the 1830s

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.

Which of the following was probably the most difficult challenge facing construction of the railroad?