Which entity has the power to exercise exclusive powers in the united states?
a. state government
b. city government
c. national government
d. the people

Which progressive reform was least related to the causes and effects of world war i? o legislation limiting the use of child labor o establishing 8-hour workdays for railroad workers o reducing tariffs on imported goods o expanding women's rights and the right to vote

On the graph, the bottom horizontal line represents

When conducting research for forming a hypothesis, which practice should historians follow?